Contact allergy investigations in healthcare workers with face mask-related skin disease.

BACKGROUND: During the COVID-19 pandemic, the use of face masks has increased among healthcare workers (HCWs). Questionnaire studies have shown a high frequency of self-reported facial adverse skin reactions. Case reports have been published on face mask-induced allergic contact dermatitis and urticaria. OBJECTIVES: To describe the results of the contact allergy investigations in consecutive HCWs investigated for skin reactions to face masks during the COVID-19 pandemic and the results of the chemical investigations of face masks supplied by the hospital. METHODS: Participants were patch tested with baseline series and chemicals previously reported in face masks not included in the baseline series. Face mask(s) brought by the HCW were tested as is and/or in acetone extract. Chemical analyses were performed on nine different face masks for potential allergens. RESULTS: Fifty-eight HCWs were investigated. No contact allergies were found to the face mask(s) tested. Eczema was the most common type of skin reaction, followed by an acneiform reaction. Colophonium-related substances were found in one respirator and 2,6-di-t-butyl-4-methylphenol (BHT) were found in two respirators. CONCLUSION: Based on this report, contact allergies to face masks is uncommon. Patch test with colophonium-related substances and BHT should be considered when investigating adverse skin reactions to face masks.

Development and Implementation of a Web-Based International Registry Dedicated to Atypical Pigmented Skin Lesions of the Face: Teledermatologic Investigation on Epidemiology and Risk Factors.

Background: Atypical pigmented facial lesions (aPFLs) often display clinical and dermoscopic equivocal and/or overlapping features, thus causing a challenging and delayed diagnosis and/or inappropriate excisions. No specific registry dedicated to aPFL paired with clinical data is available to date. Methods: The dataset is hosted on a specifically designed web platform. Each complete case was composed of the following data: (1) one dermoscopic picture; (2) one clinical picture; (3) two lesion data, that is, maximum diameter and facial location (e.g., orbital area/forehead/nose/cheek/chin/mouth); (4) patient's demographics: family history of melanoma, history of sunburns in childhood, phototype, pheomelanine, eyes/hair color, multiple nevi/dysplastic nevi on the body; and (5) acquisition device (videodermatoscope/camera-based/smartphone-based system). Results: A total of 11 dermatologic centers contributed to a final teledermoscopy database of 1,197 aPFL with a distribution of 353 lentigo maligna (LM), 146 lentigo maligna melanoma (LMM), 231 pigmented actinic keratoses, 266 solar lentigo, 125 atypical nevi, 48 seborrheic keratosis, and 28 seborrheic-lichenoid keratoses. The cheek site was involved in half of aPFL cases (50%). Compared with those with the other aPFL cases, patients with LM/LMM were predominantly men, older (69.32 ± 12.9 years on average vs. 62.69 ± 14.51), exhibited larger lesions (11.88 ± 7.74 mm average maximum diameter vs. 9.33 ± 6.46 mm), and reported a positive history of sunburn in childhood. Conclusions: The iDScore facial dataset currently represents a precious source of data suitable for the design of diagnostic support tools based on risk scoring classifiers to help dermatologists in recognizing LM/LMM among challenging aPFL in clinical practice.

Facial dermatoses induced by face masks: A systematic review and meta-analysis of observational studies.

The use of masks for infection control was common in the COVID-19 pandemic. As numerous cross-sectional studies have suggested a link between the use of such masks and various facial dermatoses, a systematic review and meta-analysis of published studies was conducted to evaluate this association, as well as potential risk factors for the development of such facial dermatoses. Observational studies were searched for in MEDLINE, EMBASE and the Cochrane Central Register. Thirty-seven observational studies with a total of 29 557 study participants were identified. This study was performed according to the Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) 2020 checklist and quality was assessed via the Newcastle-Ottawa Quality Assessment Scale., Overall prevalence of facial dermatoses was 55%. Individually, acne, facial dermatitis, itch and pressure injuries were consistently reported as facial dermatoses, with a pooled prevalence of 31%, 24%, 30% and 31%, respectively. Duration of mask-wear was the most significant risk factor for the development of facial dermatoses (95% CI: 1.31-1.54, p < 0.001). Overall, facial dermatoses associated with mask wear are common, and consist of distinct entities. They are related to duration of use. Appropriate and tailored treatment is important to improve the outcomes for these affected patients.

The change in the frequency and severity of facial dermatoses and complaints in healthcare workers during the COVID-19.

BACKGROUND: The coronavirus disease 2019 (COVID-19) pandemic has led to a dramatic increase in the use of personal protective equipment (PPE). However, the increased use of PPEs may lead to facial skin complaints. AIMS: This survey study aims to evaluate the effect of the COVID-19 pandemic on facial dermatoses and complaints. METHODS: A total of 1017 volunteers (age 18-60 years), consisting of healthcare workers, participated in the study. In the present study, healthcare professionals were screened for facial dermatoses and complaints between 1 and 15 April 2021 with an online survey. RESULTS: The vast majority of the survey were women (82.4%) and between 26 and 35 years old (49.2%). The most new-onset facial complaints were acne (25.3%) and lip dryness (29.2%). Along with the pandemic, 50.9% of patients with seborrheic dermatitis had an increase in lesions. Another remarkable result was a 60.5% increase in acne complaints. Moreover, the rate of exacerbations of rosacea, melasma, and lip dryness was increased after the COVID-19 pandemic (39.1%, 22.0%, and 42.7%, respectively). Exacerbations of seborrheic dermatitis, acne, and lip dryness have occurred more frequently in females when compared to males (p < 0.001). CONCLUSIONS: The current pandemic has had serious impacts on facial dermatoses which had to be managed carefully. Compared to the pre-pandemic period, there was a significant increase in the frequency and severity of complaints in facial dermatoses related to PPE. If the complaints that may develop due to PPE are known in advance, their development can be prevented by taking precautions against them.

Occupational facial dermatoses related to mask use in healthcare professionals.

BACKGROUND: Mask use can lead to facial dermatoses due to factors, such as hyperhydration, seborrhea, high humidity caused by sweating, and the occlusive effect of the mask. AIM: We investigated mask-related facial dermatoses in healthcare personnel who, since the beginning of the COVID-19 pandemic, had to wear a mask for long hours. METHODS: In this study, healthcare professionals working at Medipol Mega University Hospital since the beginning of the pandemic were screened for facial dermatoses between December 2020 and February 2021 with a dermatological examination and interview. RESULTS: Of the 101 healthcare professionals, 51 (50.5%) were doctors and 50 (49.5%) nurses, and 36 (35.6%) were male and 65 (64.4%) were female. All the participants had been actively working at the hospital for 35-46 weeks since the beginning of the pandemic and wearing N95 or surgical masks for an average of 6-13 h a day. During the dermatological examination, the most common facial dermatosis was acne, which was observed in 55.4% (n = 56) of the cases. Of the 56 acne cases, 41.1% (n = 23) had acne in their history, while 58.9% (n = 33) had new-onset acne. Being female, using a N95 surgical mask compared to surgical mask, and the daily average duration of mask use were determined as risk factors for acne development due to mask use. CONCLUSIONS: The use of masks, more frequently N95, caused both an increase in existing acne and the development of new acne.

"Face mask dermatitis" due to compulsory facial masks during the SARS-CoV-2 pandemic: data from 550 health care and non-health care workers in Germany.

BACKGROUND: During the COVID-19 pandemic, wearing face masks is mandatory not only for health care workers (HCWs) but also for the general population in many countries around the globe. OBJECTIVES: The aim of the study was to investigate the onset of adverse facial skin reactions due to compulsory face masks during the COVID-19 pandemic in HCWs and non-HCWs, and draw awareness of this new dermatological condition and its preventive measures. MATERIALS & METHODS: A questionnaire was distributed to 550 patients and HCWs from the Department of Dermatology and Allergy of the University Hospital Munich (LMU), Germany. Participants were surveyed regarding mask type, duration of usage and adverse facial skin reactions. Information on symptoms and the use of skin care products and topical drugs were retrieved. RESULTS: The duration of wearing masks showed a significant impact on the prevalence of symptoms (p < 0.001). Type IV hypersensitivity was significantly more likely in participants with symptoms compared to those without symptoms (p = 0.001), whereas no increase in symptoms was observed in participants with atopic diathesis. HCWs used facial skin care products significantly more often than non-HCWs (p = 0.001). CONCLUSION: Preventive and therapeutic measures should be established in order to avoid "face mask dermatitis", especially for people with underlying risk factors.

Frequency of sensitization to the individual fragrances of fragrance mix I and II according to the factors included in the MOAHLFA index.

BACKGROUND: Fragrances constitute the second most frequent cause of allergic contact dermatitis in Spain. OBJECTIVES: To determine the rate of sensitization to the individual fragrances of fragrance mix (FM) I and FM II for each of the demographic and clinical factors included in the MOAHLFA (male, occupational dermatitis, atopic dermatitis, hand dermatitis, leg dermatitis, facial dermatitis, age) index. METHODS: We conducted a 5-year retrospective study in 23 Spanish centres. We identified the patients who had undergone patch testing with a specific fragrance series after reacting positively to fragrance markers in a baseline series. We obtained the MOAHLFA index items in this population, then calculated for each demographic and clinical factor the frequencies of sensitization to the individual fragrances of FM I and FM II. RESULTS: A specific fragrance series was patch tested in 1013 patients. The most frequent allergens in men, women, children, and retired people were Evernia prunastri (16%), geraniol (16.6%), isoeugenol (17.9%), and geraniol (22.4%), respectively. Citral (20.5%) and hydroxyisohexyl 3-cyclohexene carboxaldehyde (HICC) (14.5%) were the most common allergens in occupational eczemas and were also associated with a large proportion of hand and facial dermatitis. CONCLUSIONS: Frequency of sensitization to the individual fragrances of FM I and FM II varies with age, sex, affected body region, and history of occupational or atopic dermatitis.

Facial and neck erythema associated with dupilumab treatment: A systematic review.

BACKGROUND: Neither dupilumab-associated facial erythema nor neck erythema was reported in phase 3 clinical trials for the treatment of atopic dermatitis, but there have been a number of reports of patients developing this adverse event in clinical practice. OBJECTIVE: To outline all cases of reported dupilumab-associated facial or neck erythema to better characterize this adverse event, and identify potential etiologies and management strategies. METHODS: A search was conducted on EMBASE and PubMed databases. Two independent reviewers identified relevant studies for inclusion and performed data extraction. RESULTS: A total of 101 patients from 16 studies were reported to have dupilumab-associated facial or neck erythema. A total of 52 of 101 patients (52%) had baseline atopic dermatitis facial or neck involvement and 45 of 101 (45%) reported different cutaneous symptoms from preexisting atopic dermatitis, possibly suggesting a different etiology. Suggested etiologies included rosacea, allergic contact dermatitis, and head and neck dermatitis. Most commonly used treatments included topical corticosteroids, topical calcineurin inhibitors, and antifungal agents. In the 57 patients with data on the course of the adverse events, improvement was observed in 29, clearance in 4, no response in 16, and worsening in 8. A total of 11 of 101 patients (11%) discontinued dupilumab owing to this adverse event. LIMITATIONS: Limited diagnostic testing, nonstandardized data collection and reporting across studies, and reliance on retrospective case reports and case series. CONCLUSION: Some patients receiving dupilumab develop facial or neck erythema that differs from their usual atopic dermatitis symptoms. Prompt identification and empiric treatment may minimize distress and potential discontinuation of dupilumab owing to this adverse event.

GWAS Analysis of 17,019 Korean Women Identifies the Variants Associated with Facial Pigmented Spots.

Variation in skin pigmentation can be affected by both environmental factors and intrinsic factors such as age, gender, and genetic variation. Recent GWASs revealed that genetic variants of genes functionally related to a pigmentation pathway were associated with skin pigmentary traits. However, these GWASs focused on populations with European ancestry, and only a few studies have been performed on Asian populations, limiting our understanding of the genetic basis of skin pigmentary traits in Asians. To evaluate the genetic variants associated with facial pigmented spots, we conducted a GWAS analysis of objectively measured facial pigmented spots in 17,019 Korean women. This large-scale GWAS identified several genomic loci that were significantly associated with facial pigmented spots (five previously reported loci and two previously unreported loci, to our knowledge), which were detected by UV light: BNC2 at 9p22 (rs16935073; P-value = 2.11 × 10-46), PPARGC1B at 5q32 (rs32579; P-value = 9.04 × 10-42), 10q26 (rs11198112; P-value = 9.66 × 10-38), MC1R at 16q24 (rs2228479; P-value = 6.62 × 10-21), lnc01877 at 2q33 (rs12693889; P-value = 1.59 × 10-11), CDKN2B-AS1 at 9p21 (rs643319; P-value = 7.76 × 10-9), and MFSD12 at 19p13 (rs2240751; P-value = 9.70 × 10-9). Further functional characterization of the candidate genes needs to be done to fully evaluate their contribution to facial pigmented spots.

Methylchloroisothiazolinone/methylisothiazolinone and methylisothiazolinone contact allergy: A 24-year, single-center, retrospective cohort study from Turkey.

BACKGROUND: Methylchloroisothiazolinone/methylisothiazolinone (MCI/MI) and MI allergy caused a global epidemic during the period 2010 to 2015, reaching its peak in 2013/14. OBJECTIVE: To investigate the characteristics of MCI/MI and MI allergy in Turkey over 24 years. METHODS: A total of 2310 patients patch tested between 1996 and 2019 with MCI/MI 0.01% aq. or MCI/MI 0.02% aq., with or without MI 0.2% aq., were analyzed. RESULTS: The overall prevalence of contact sensitization was 3.3% (n = 77) with a peak level of 16.4% in 2015. The prevalence gradually decreased thereafter, but was still high (6.5%) in 2019. Seventy-three patients had clinically relevant sensitizations. MI could detect clinically relevant sensitizations in all seven patients with a negative patch test reaction to MCI/MI 0.02%. Non-occupational allergic contact dermatitis (ACD) was most frequently seen, mainly in women, with hand/face eczema from rinse-off or leave-on cosmetics, such as wet wipes. Occupational ACD was mainly seen among men with airborne eczema from wall paints in house painters, or with hand eczema from hair gel/wax in men's barbers. CONCLUSIONS: The prevalence of MCI/MI and MI sensitization in Turkey following the peak in 2015 is still high. This is probably due to the currently allowed level of 100 ppm for MI in rinse-off cosmetics. This needs to be urgently reduced.

Occupational dermatitis to facial personal protective equipment in health care workers: A systematic review.

BACKGROUND: Prolonged wear of facial protective equipment can lead to occupational dermatoses. OBJECTIVE: To identify important causes of occupational dermatoses from facial protective equipment. METHODS: A systematic review following Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines was performed using PubMed and Embase databases. Articles were included if they reported occupational dermatoses caused by surgical/procedure masks or N95 respirators, or both. RESULTS: We identified 344 articles, and 16 were suitable for inclusion in this review. Selected articles focused on facial occupational dermatoses in health care workers. Allergic contact dermatitis to the elastic straps, glue, and formaldehyde released from the mask fabric was reported. Irritant contact dermatitis was common on the cheeks and nasal bridge due to pressure and friction. Irritant dermatitis was associated with personal history of atopic dermatitis and prolonged mask wear (>6 hours). Acneiform eruption was reported due to prolonged wear and occlusion. Contact urticaria was rare. LIMITATIONS: Only publications listed in PubMed or Embase were included. Most publications were case reports and retrospective studies. CONCLUSION: This systematic review from members of the American Contact Dermatitis Society highlights cases of occupational dermatitis to facial protective equipment, including potential offending allergens. This work may help in the diagnosis and treatment of health care workers with facial occupational dermatitis.

Frequency of different types of facial melanoses referring to the Department of Dermatology and Venereology, Nepal Medical College and Teaching Hospital in 2019, and assessment of their effect on health-related quality of life.

BACKGROUND: Abnormalities of facial pigmentation, or facial melanoses, are a common presenting complaint in Nepal and are the result of a diverse range of conditions. OBJECTIVES: The objective of this study was to determine the frequency, underlying cause and impact on quality of life of facial pigmentary disorders among patients visiting the Department of Dermatology and Venereology, Nepal Medical College and Teaching Hospital (NMCTH) over the course of one year. METHODS: This was a cross-sectional study conducted at the Department of Dermatology and Venereology, NMCTH. We recruited patients with facial melanoses above 16 years of age who presented to the outpatient department. Clinical and demographic data were collected and all the enrolled participants completed the validated Nepali version of the Dermatology Life Quality Index (DLQI). RESULTS: Between January 5, 2019 to January 4, 2020, a total of 485 patients were recruited in the study. The most common diagnoses were melasma (166 patients) and post acne hyperpigmentation (71 patients). Quality of life impairment was highest in patients having melasma with steroid induced rosacea-like dermatitis (DLQI = 13.54 ± 1.30), while it was lowest in participants with ephelides (2.45 ± 1.23). CONCLUSION: Facial melanoses are a common presenting complaint and lead to substantial impacts on quality of life. Accurate diagnosis and management can prevent or treat many facial melanoses, including those that lead to substantial loss of quality of life, such as melasma with steroid induced rosacea-like dermatitis. Health care systems in low and middle-income countries should dedicate resources to the identification, prevention and treatment of these conditions to improve quality of life.

Striae Gravidarum, Acne, Facial Spots, and Hair Disorders: Risk Factors in a Study with 1284 Puerperal Patients.

OBJECTIVE: To determine the prevalence of skin changes during pregnancy and to relate their occurrence to specific factors in a population of south Brazil. METHODS: A cross-sectional analytical study was carried out with 1284 puerperal patients. A questionnaire about skin changes during pregnancy was developed and applied by the authors to all puerperal women admitted in a tertiary hospital in south Brazil. RESULTS: The appearance of striae during pregnancy was reported by 633 women (49.5%) and had a statistically significant association with primiparity, presence of stretch marks before pregnancy, and gestational weight gain above 21 kg. Facial blemishes were reported by 33.9% (n = 434) and were associated with a positive family history, multiparity, and the use of facial sunscreen (p < 0.0001). The onset or worsening of acne was identified in 35.7% (n = 456) and was statistically associated with primiparity and Fitzpatrick phototypes IV and V. Hair alterations were reported by 44.5% (n = 569) and were associated with primiparity (p = 0.029). CONCLUSION: Although most of the skin changes during pregnancy are considered "physiologic," they can cause significant discomfort. Thus, it is important to know them and to understand which risk factors may be associated with such changes.

Face Mask-induced Itch: A Self-questionnaire Study of 2,315 Responders During the COVID-19 Pandemic.

Little is known about itch related to the use of face masks. This internet survey study investigated the prevalence, intensity and clinical characteristics of itch related to the use of face masks by the general public during the COVID-19 pandemic. A total of 2,315 replies were received, of which 2,307 were included in the final analysis. Of the respondents, 1,393 (60.4%) reported using face masks during the previous week, and, of these, 273 (19.6%) participants reported having itch. Subjects who reported sensitive skin and atopic predisposition, and those with facial dermatoses (acne, atopic dermatitis or seborrhoeic dermatitis) were at significantly higher risk of itch development. The high-est rating of itch for the whole group on the Itch Numeral Rating Scale was 4.07 ± 2.06 (itch of moderate intensity). Responders who wore masks for longer periods more frequently reported itch. Almost 30% of itchy subjects reported scratching their face without removing the mask, or after removing the mask and then scratching. Wearing face masks is linked to development of itch, and scratching can lead to incorrect use of face masks, resulting in reduced protection.

Anxiety, Depression, and Suicidal Ideation amongst Patients with Facial Dermatoses (Acne, Rosacea, Perioral Dermatitis, and Folliculitis) in Lithuania.

BACKGROUND/OBJECTIVE: Skin diseases, especially those with visible manifestation, are considered to cause a major influence on global mental health. Therefore, we determined the prevalence and severity of anxiety, depression, and suicidal ideation in a large sample of patients with facial dermatoses, namely acne, rosacea, folliculitis, and perioral dermatitis. METHODS: The mental health of patients with facial dermatoses and respective controls was assessed using the Hospital Anxiety and Depression Scale and questions concerning suicidal ideation. RESULTS: The study included 543 patients with facial dermatoses and 497 healthy individuals. Anxiety was present in 37.6% of the patients (14.9% of controls), depression in 21.7% (6.8%), and suicidal thoughts in 9.8% (3.2%) (p < 0.001). Acne patients demonstrated the highest anxiety and depression subscale scores (mean ± standard deviation: 7.1 ± 0.25, 95% confidence interval (CI): 6.58-7.56; controls: 5 ± 0.23, 95% CI: 4.57-5.49). In rosacea 30% of the patients had depression symptoms (adjusted odds ratio (OR): 7.216, 95% CI: 4.122-12.632, p < 0.001), while in folliculitis patients 15.4% (OR: 3.138, 95% CI: 1.241-7.936, p = 0.016) had suicidal thoughts. Patients with anxiety symptoms and suicidal thoughts were on average younger than those without (28.3 ± 0.76 vs. 31.2 ± 0.66 years, p = 0.001 and 25.3 ± 0.98 vs. 30.5 ± 0.55 years, p = 0.007, respectively). CONCLUSION: Acne and rosacea are associated with anxiety, depression, and suicidal ideation in Lithuanian patients. Younger patients are more prone to report such symptoms than older ones.

Occupational contact dermatitis in Triveneto: Analysis of patch test data of the North Eastern Italian Database from 1996 to 2016.

BACKGROUND: Occupational contact dermatitis (OCD) is frequent in the workplace. OBJECTIVES: To provide recent data on the epidemiology of OCD in Italy. METHODS: This multicenter retrospective study, conducted from 1996 to 2016, included patients with suspected allergic contact dermatitis (ACD) patch tested in the departments comprising the North-East Italy Contact Dermatitis Group. RESULTS: We studied 18 859 workers with a diagnosis of contact dermatitis (CD), of which 10.4% were recognized as being of professional origin. OCD declined from 1996 to 2011-2013 and increased in 2014-2016. The overall prevalence of both CD and OCD was higher in women compared to men, but the share of OCD of the total CD was greater for men compared to women. A history of atopic dermatitis was less frequent in workers with OCD than in non-OCD patients (5.8% vs 8.6%). Hairdressers were the youngest profession (27.1 ± 11.7 years). Hands were the primary site of involvement in patients with OCD (76.6%). The five highest risk occupations for OCD were hairdressers, cooks, metalworkers, chemical industry workers, and construction workers. CONCLUSIONS: OCDs have a relevant impact in our region, mainly for five job categories, and the increase in the last 3 years suggests the need to improve preventive measures.

Facial Dermatitis in Male Patients Referred for Patch Testing: Retrospective Analysis of North American Contact Dermatitis Group Data, 1994 to 2016.

Importance: Facial dermatitis in women is well characterized. However, recent shifts in the men's grooming industry may have important implications for male facial dermatitis. Objective: To characterize male patients with facial dermatitis. Design, Setting, and Participants: A 22-year retrospective cross-sectional analysis (1994-2016) of North American Contact Dermatitis Group (NACDG) data, including 50 507 patients who underwent patch testing by a group of dermatology board-certified patch test experts at multiple centers was carried out. Facial dermatitis was defined as involvement of the eyes, eyelids, lips, nose, or face (not otherwise specified). Main Outcomes and Measures: The main outcome was to compare characteristics (including demographics and allergens) between male patients with facial dermatitis (MFD) and those without facial dermatitis (MNoFD) using statistical analysis (relative risk, CIs). Secondary outcomes included sources of allergic and irritant contact dermatitis and, for occupationally related cases, specific occupations and industries in MFD. Results: Overall, 1332 male patients (8.0%) were included in the MFD group and 13 732 male patients (82.0%) were included in MNoFD. The mean (SD) age of participants was 47 (17.2) years in the MFD group and 50 (17.6) years in the MNoFD group. The most common facial sites were face (not otherwise specified, 817 [48.9%]), eyelids (392 [23.5%]), and lips (210 [12.6%]). Participants in the MFD group were significantly younger than MNoFD (mean age, 47 vs 50 years; P < .001). Those in the MFD group were less likely to be white (relative risk [RR], 0.92; 95% CI, -0.90 to 0.95) or have occupationally related skin disease (RR, 0.49; 95% CI, -0.42 to 0.58; P < .001) than MNoFD. The most common allergens that were associated with clinically relevant reactions among MFD included methylisothiazolinone (n = 113; 9.9%), fragrance mix I (n = 27; 8.5%), and balsam of Peru (n = 90; 6.8%). Compared with MNoFD, MFD were more likely to react to use of dimethylaminopropylamine (RR, 2.49; 95% CI, -1.42 to 4.37]) and paraphenylenediamine (RR, 1.43; 95% CI, -1.00 to 2.04; P < .001). Overall, 60.5% of NACDG allergen sources were personal care products. Conclusions and Relevance: Although many allergens were similar in both groups, MFD were more likely to react to use of dimethylaminopropylamine and paraphenylenediamine, presumably owing to their higher prevalence in hair products. Most sources of allergic and irritant contact dermatitis in MFD were personal care products. This study provides insight into the risks and exposures of the increasing number of grooming products used by male dermatology patients. This will enable clinicians to better identify male patients who would benefit from patch testing and treat those with facial dermatitis.

Contact allergy to hair cosmetic allergens in Thailand.

BACKGROUND: Hair cosmetics such as hair dyes, bleaching, waving, and cleansing products are composed of numerous chemical ingredients. Allergic reactions to these contact allergens, other than p-phenylenediamine, are rarely reported. OBJECTIVES: To study the incidence of patch test reactions to hair cosmetic allergens and identify the factors associated with hair cosmetic allergy in Thailand. METHODS: We retrospectively reviewed the case records of patients who underwent patch testing from 2009 to 2018. Patients with at least one positive patch test reaction to a potential contact allergen associated with hair cosmetic ingredients were studied. RESULTS: Overall, 2842 patients were patch tested. Of the hair cosmetic allergen categories, preservatives had the highest rate of positive reactions, followed by surfactants and hair dyes. Perming agents were less problematic in comparison. The hands, head, and neck were the predominately affected sites of allergic reactions to hair cosmetic ingredients. CONCLUSIONS: Preservatives, surfactants, and hair dyes are important contact allergens, whereas perming agents are less likely to cause allergic reactions. Hair cosmetic ingredients are regulated by national agencies, which influences their extent of exposure and rates of contact allergies. Further continuous observation of hair cosmetic allergy is needed to provide the best patient care.