Efficient diagnosis of psoriasis and lichen planus cutaneous diseases using deep learning approach.

The tendency of skin diseases to manifest in a unique and yet similar appearance, absence of enough competent dermatologists, and urgency of diagnosis and classification on time and accurately, makes the need of machine aided diagnosis blatant. This study is conducted with the purpose of broadening the research in skin disease diagnosis with computer by traversing the capabilities of deep Learning algorithms to classify two skin diseases noticeably close in appearance, Psoriasis and Lichen Planus. The resemblance between these two skin diseases is striking, often resulting in their classification within the same category. Despite this, there is a dearth of research focusing specifically on these diseases. A customized 50 layers ResNet-50 architecture of convolutional neural network is used and the results are validated through fivefold cross-validation, threefold cross-validation, and random split. By utilizing advanced data augmentation and class balancing techniques, the diversity of the dataset has increased, and the dataset imbalance has been minimized. ResNet-50 has achieved an accuracy of 89.07%, sensitivity of 86.46%, and specificity of 86.02%. With their promising results, these algorithms make the potential of machine aided diagnosis clear. Deep Learning algorithms could provide assistance to physicians and dermatologists by classification of skin diseases, with similar appearance, in real-time.

Non-bullous Lichen Planus Pemphigoides: A Case Report.

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Classic and Hypertrophic Vulvar Lichen Planus.

OBJECTIVES: Three types of lichen planus (LP) occur on the vulva: erosive, classic, and hypertrophic. The latter 2 occur on keratinized skin and little is known about their clinicopathologic appearance. MATERIALS AND METHODS: Vulvar biopsies of keratinized skin reported as LP or "lichenoid" between 2011 and 2017 were reviewed. Inclusion required age of older than 18 years, a lichenoid tissue reaction, and insufficient abnormal dermal collagen to diagnose lichen sclerosus. Clinical and histopathologic data were collected and cases were categorized as hypertrophic, classic, or nonspecific lichenoid dermatosis. Descriptive statistics were performed and groups were compared with the Fisher exact test. RESULTS: Sixty-three cases met criteria for inclusion. Twenty-nine (46%) cases were categorized as hypertrophic LP, 21 (33%) as classic LP, and 13 (21%) as nonspecific lichenoid dermatosis. There were no significant differences in age, primary symptom, biopsy location, or duration of disease between the 3 groups. When compared with classic and nonspecific disease, hypertrophic LP was less likely to have comorbid dermatoses and more likely to be red, diffuse, have scale crust, and contain plasma cells in the infiltrate. Nonspecific disease had similar clinical features to classic LP but was less likely than the other 2 categories to have a dense lymphocytic infiltrate and exocytosis. CONCLUSIONS: Vulvar LP on keratinized skin has a diversity of appearances and presents a clinicopathologic challenge. Further research is required to understand the natural history of hypertrophic LP and the underlying diagnosis of nonspecific lichenoid cases.

How general dentists could manage a patient with oral lichen planus

Background: The literature hardly contains information on how patients suffering from oral lichen planus could be managed by dentists. Material and Methods: Based on the limited available literature and particularly on the long-term clinical and histopathological experience of one of the authors, suggestions on how dentists could manage patients with oral lichen planus have been put forward. Results: In most cases, the dentist should be able to establish a correct diagnosis. Occasionally, the dentist may call upon a specialist, usually an oral medicine specialist or an oral and maxillofacial surgeon for confirmation of the diagnosis, possibly a biopsy procedure, and management of the patient in case of severe symptoms. Proper patient information is of utmost importance in the management. Conclusions: General dentists can be expected to manage the majority of patients with oral lichen planus. Some patients may need to be referred for diagnostic purposes to a specialist; this is also the case for the rare patient with severe symptoms, possibly requiring systemic treatment (AU)

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[Lichen ruber planus : Better understanding, better treatment!] / Lichen ruber planus : Besser verstehen, besser behandeln!

Lichen ruber, also called lichen ruber planus or lichen planus (LP), is a noncontagious inflammatory skin disease. LP is the main representative and namesake of the group of lichenoid diseases, which are characterized by small papules often accompanied by severe itching. With 65% of cases, LP is primarily a disease of the mucous membranes. In 20% of the cases, the disease is found on the skin and mucous membranes; skin involvement alone is seen in only about 10% of cases. Cutaneous LP has a very favorable 1­year prognosis of almost 80% healing as opposed to the mucosa and the adnexal organs. Histologically, keratinocytes with vacuolar degeneration, leaving behind apoptotic Kamino bodies and the characteristic band-shaped lymphocytic infiltrate at the dermatoepithelial junction, are common to lichenoid diseases. The horny layer is firm and compact and the stratum granulosum is thickened as a correlate of the Wickham stripes. The molecular pathogenesis, still partially hypothetical, assumes trigger factors leading to the presentation of intrinsic or foreign antigens. The triggered inflammation becomes independent in the sense of a classical cell-mediated autoimmune disease. Other autoimmune diseases are often associated with LP. Classical anti-inflammatory-immunosuppressive therapeutic concepts dominate with systemic retinoids ranking first in the highest evidence class for cutaneous LP with limitations in treatment of both mucosal and adnexal LP. More recently, interesting and new complementary phototherapeutics have been identified.

Update on Frontal Fibrosing Alopecia. / Actualización en alopecia frontal fibrosante.

Frontal fibrosing alopecia (FFA) is an increasingly common acquired primary scarring alopecia, first described by Kossard in 1994. Clinically it is characterized by frontotemporal hairline recession, frequently accompanied by eyebrow loss. FFA was initially thought to have a hormonal origin as it was first described in postmenopausal women and premenopausal women with a history of hysterectomy or early menopause. This origin, however, has been questioned in recent years due to the publication of cases in men and premenopausal women. Although FFA has a highly characteristic clincal pattern, it is histologically similar to lichen planopilaris, and is currently believed to be a clinical variant of this condition. No clinical trials to date have investigated the efficacy of treatments for FFA. Numerous drugs, however, have been assessed in observational studies, and the best results to date have been reported for 5-αreductase inhibitors and intralesional corticosteroids, followed by antimalarials and calcineurin inhibitors. In this article, we review the latest data on the etiology, pathogenesis, clinical presentation, diagnosis, and treatment of FFA.

A New Subtype of Lichen Planopilaris Affecting Vellus Hairs and Clinically Mimicking Androgenetic Alopecia.

BACKGROUND: Lichen planopilaris (LPP) is a follicular variant of lichen planus. A new subtype of LPP mimicking androgenetic alopecia (AGA) may be misdiagnosed. Inappropriate medical therapy or hair transplantation may exacerbate this subtype. OBJECTIVE: To introduce clinicopathologic findings of a new subtype of LPP that selectively affects vellus hair in the pattern of AGA. MATERIALS AND METHODS: In a cross-sectional study, 433 (66.6%) men and 217 (33.4%) women with alopecia who were candidates of medical treatment or hair transplantation were included. Gross and microscopic attributes of their diseases were investigated. RESULTS: Among the total of 650 patients, 58 (8.9%; 95% confidence interval, 6.7%-11.1%) patients, including 52 women and 6 men, had LPP. We identified a distinct category of LPP presenting with diffuse hair loss in the pattern of AGA with predominant terminal hair, significant decrease in vellus hair, and minute punctuate scars in histopathology. Vellus hair follicles were the main sites of involvement. Perifollicular fibrosis and mild fibrosis with lichenoid lymphocytic infiltration around infundibular area of vellus hair follicles were present. CONCLUSION: There is a new form of LPP with clinical features similar to AGA. This form is histopathologically similar to LPP but selectively affects vellus hair follicles.

Interleukin-6 and neopterin levels in the serum and saliva of patients with Lichen planus and oral Lichen planus.

BACKGROUND: Lichen planus together with its oral variant is a chronic, inflammatory disease of the skin and the mucosa of unclear aetiology and with an unpredictable course that still poses a major problem in terms of diagnosis and treatment. The objective of this study was to assess the concentrations of interleukin-6 (IL-6) and neopterin in saliva and serum of patients with lichen planus (including reticular and erosive form of oral lichen planus) and to compare them with the concentrations observed in healthy controls. METHODS: The study material comprised serum and saliva samples from 56 patients diagnosed with lichen planus and 56 healthy volunteers. The ELISA test was used to measure concentrations of IL-6 and neopterin in the serum and saliva of the study participants. RESULTS: The concentrations of IL-6 in saliva and serum of patients with lichen planus were significantly higher than in controls (P = 0.0002; P < 0.0001). The difference remains significant after adjustment for gingivitis and age. Patients with atrophic-erosive oral lichen planus had significantly higher IL-6 concentrations in their saliva compared to patients with reticular form of disease (P = 0.01). The concentrations of neopterin were significantly higher in the serum but not in saliva of lichen planus patients vs. controls (P <0.0001). CONCLUSIONS: Serum levels of proinflammatory cytokines IL-6 and neopterin are increased in lichen planus as well as the salivary concentrations of IL-6. The differences observed in IL-6 levels in patients with erosive-atrophic forms of oral lichen planus may indicate a substantial role played by the cytokine in the disease.

Cutaneous and mucosal lichen planus: a comprehensive review of clinical subtypes, risk factors, diagnosis, and prognosis.

Lichen planus (LP) is a chronic inflammatory disorder that most often affects middle-aged adults. LP can involve the skin or mucous membranes including the oral, vulvovaginal, esophageal, laryngeal, and conjunctival mucosa. It has different variants based on the morphology of the lesions and the site of involvement. The literature suggests that certain presentations of the disease such as esophageal or ophthalmological involvement are underdiagnosed. The burden of the disease is higher in some variants including hypertrophic LP and erosive oral LP, which may have a more chronic pattern. LP can significantly affect the quality of life of patients as well. Drugs or contact allergens can cause lichenoid reactions as the main differential diagnosis of LP. LP is a T-cell mediated immunologic disease but the responsible antigen remains unidentified. In this paper, we review the history, epidemiology, and clinical subtypes of LP. We also review the histopathologic aspects of the disease, differential diagnoses, immunopathogenesis, and the clinical and genetic correlations.

Lichen planopilaris: Epidemiology and prevalence of subtypes - a retrospective analysis in 104 patients.

BACKGROUND: Management of patients with lichen planopilaris (LPP) and frontal fibrosing alopecia (FFA) is rendered difficult as robust epidemiologic data, insights on pathogenesis, associated diseases, possible relevance of concomitant medications or environmental factors are lacking. PATIENTS AND METHODS: Retrospective analysis of demography, skin status, concomitant medication and diagnostic procedures were performed on 104 medical records (71 classic LPP, 32 FFA, and one Graham-Little-Piccardi-Lassueur syndrome). RESULTS: Women were more often affected (distribution F: M classic LPP 4.9: 1; FFA: 31: 1). Compared to LPP patients, patients with FFA were significantly older (p < 0.001), more often postmenopausal, and more frequently on hormone replacement therapy. No other specific associations were identified. An association with lichen planus, other autoimmune diseases, or hepatitis virus infection was found only in individual patients. Clinically, FFA patients were significantly more often reported to have reduced eyebrows (p < 0.005), axillary, and/or pubic hair (p = 0.050). CONCLUSIONS: The findings obtained from this study, with currently largest LPP/FFA patient cohort in Germany, encouraged us to set up a national FFA patient registry. Prospective data collected from larger numbers of patients with standardized questionnaires will help to assess assumed associations and influencing factors and to develop, in the long-term, recommendations for diagnosis and treatment.

The evolution of clinicopathologic features in eruptive lichen planus: a case report and review of literature.

"Eruptive" or "exanthematous" lichen planus (LP) is a rare variant of lichen planus. Here we report a middle-aged woman with a 6-month history of episodic eruptive LP presenting as generalized, erythematous, flat-topped, round, polygonal, or umbilicated papules and hyperpigmented macules. The disease was under good control with continuous low-dose prednisolone over one year. We had the opportunity to correlate the clinical and pathologic findings based on histopathologic examination of three separate skin lesions that appeared to represent different stages of evolution. Recognition of these 3 chronological manifestations (polygonal papule in active inflammation, centrally umbilicated papule in involution, and hyperpigmented macule in resolution) can aid the diagnosis.

Clinical variants of lichen planus.

Lichen planus is characterized by lichenoid, polygonal papules with fine white lines, called Wickham striae. Lesions most commonly occur on the limbs and on the dorsal aspect of the trunk. At the same time often leukoplakia of mucous membranes as well as nail disorders are seen. There are numerous variants of lichen planus which can be distinguished from the classical form on the basis of morphology and distribution of the lesions. The typical primary lesion of lichen planus may be replaced by other forms, such as patches, hyperkeratoses, ulcerations, or bullous lesions. Moreover, distribution patterns of these lesions may vary and include erythrodermic, inverse or linear arrangements. In contrast to these numerous clinical features, histologic findings remain characteristic in the variants, so that the diagnosis can be made securely. Differential diagnoses of lichen planus include diverse dermatoses such as bullous pemphigoid or paronychia.

The prevalence of hepatitis C Virus (HCV) among lichen planus patients and its clinical pattern at the University of Abuja Teaching Hospital, Gwagwalada, Abuja, Nigeria.

OBJECTIVE: The relationship between hepatitis C virus and Lichen Planus have been widely reported in the literature; although there are wide geographical variations in the reported prevalence of hepatitis C virus infection in patients with lichen planus. This study seeks to determine the prevalence of hepatitis C virus among lichen planus patients and its clinical morphological type in the University of Abuja Teaching Hospital, Gwagwalada Abuja, Nigeria. MATERIALS/METHODS: This study was conducted between January 2010 and December, 2011 at the out patients Dermatological unit of the department of medicine at the University of Abuja Teaching Hospital Gwagwalada Abuja, Nigeria. Consecutive patients who had body eruptions suspected to be lichen planus were recruited and histology done for confirmation. The control group included patients' relations and some dermatology patients known to have low risk of hepatitis C virus infection and liver function tests done for both subjects and control after obtaining oral consent from them to participate in the study. RESULT: Anti- HCV antibodies were detected in nine cases (21.4%) and one case (3.3%) in the control group. This was statistically significant difference between the HCV antibody among the subject and control group (P<0.038). Hypertrophic lichen planus was the most frequent clinical type. Liver function test was not statistically significant among the subject and control group. CONCLUSION: Lichen planus and Hepatitis C virus appear to have a relationship and the prevalence rate was higher among the subject as compared to the control group in our environment.

Lichenoid tissue reaction/interface dermatitis: recognition, classification, etiology, and clinicopathological overtones.

Lichenoid tissue reaction or interface dermatitis embrace several clinical conditions, the prototype of which is lichen planus and its variants, drug induced lichenoid dermatitis, special forms of lichenoid dermatitis, lichenoid dermatitis in lupus erythematosus, and miscellaneous disorders showing lichenoid dermatitis, the salient clinical and histological features of which are described to facilitate their diagnosis. Background of lichenoid reaction pattern has been briefly outlined to enlighten those interested in this entity.