Postauricular skin: an excellent donor site for split-thickness skin grafts for the head, neck, and upper chest.

BACKGROUND: Postauricular skin is one of the potential donor sites for split-thickness skin grafts (STSGs). OBJECTIVE: To objectively quantify how postauricular donor sites heal after STSG harvesting. MATERIALS AND METHODS: A cohort of 39 Mohs micrographic surgery patients repaired with STSGs (total 41 surgical defects) was established. Scars resulting from postauricular donor site harvesting were objectively quantified by applying the Vancouver Scar Scale (VSS), in which healing of scars is ranked from 0 (best possible outcome) to 13 (worst possible outcome). RESULTS: Vancouver Scar Scale scores were 1.87 for sites followed for ≥6 months (n = 16), 3 for sites followed for 3 to 6 months (n = 7), and 1.61 for sites followed for 6 to 11 weeks (n = 18). Four patients developed mild hypertrophic scarring that resolved spontaneously or with intralesional triamcinolone injections at a concentration of 10 mg/mL. CONCLUSION: The postauricular skin is an excellent donor site for small-to-moderate sized STSGs (<10 cm). The donor sites healed well, as noted by the low scores on the VSS consistent with mild changes in erythema, pigmentation, and texture. The incidence of hypertrophic scarring was low and resolved with observation or treatment.

Impact of long-wavelength UVA and visible light on melanocompetent skin.

The purpose of this study was to determine the effect of visible light on the immediate pigmentation and delayed tanning of melanocompetent skin; the results were compared with those induced by long-wavelength UVA (UVA1). Two electromagnetic radiation sources were used to irradiate the lower back of 20 volunteers with skin types IV-VI: UVA1 (340-400 nm) and visible light (400-700 nm). Pigmentation was assessed by visual examination, digital photography with a cross-polarized filter, and diffused reflectance spectroscopy at 7 time points over a 2-week period. Confocal microscopy and skin biopsies for histopathological examination using different stains were carried out. Irradiation was also carried out on skin type II. Results showed that although both UVA1 and visible light can induce pigmentation in skin types IV-VI, pigmentation induced by visible light was darker and more sustained. No pigmentation was observed in skin type II. The quality and quantity of pigment induced by visible light and UVA1 were different. These findings have potential implications on the management of photoaggravated pigmentary disorders, the proper use of sunscreens, and the treatment of depigmented lesions.

Prospective controlled clinical and histopathologic study of hidradenitis suppurativa treated with the long-pulsed neodymium:yttrium-aluminium-garnet laser.

BACKGROUND: Hidradenitis suppurativa (HS) is a chronic inflammatory disease involving the intertriginous areas. OBJECTIVE: We sought to conduct clinical and histopathologic evaluation of the efficacy of long-pulsed neodymium:yttrium-aluminium-garnet laser treatment for HS. METHODS: We conducted a prospective, randomized, right-left within-patient controlled trial for HS (n = 22). Four monthly laser sessions were performed. Disease activity was measured at baseline, and treatment response was assessed before each laser session and monthly for 2 months after the completion of laser treatment, using a modified scoring system based on Sartorius score. Histologic examination was performed at baseline, immediately after laser treatment, and at 1 and 4 weeks after treatment. A patient questionnaire was circulated on the last visit to assess patients' level of satisfaction. RESULTS: There was progressive improvement in disease activity, most significantly during the 4 months of treatment, which was maintained during the 2-month posttreatment follow-up period. Averaged over all anatomic sites, the percent improvement was 72.7% on the laser treated side, and 22.9% on the control side (P < .05). Histologic examination showed an initial acute neutrophilic infiltrate. Granulomatous inflammation was present on follow-up biopsy specimens 4 weeks later. An inflammatory infiltrate surrounded the hair shaft remnants, denoting destruction of hair follicles. LIMITATIONS: Small sample size was a limitation. CONCLUSIONS: Long-pulsed neodymium:yttrium-aluminium-garnet laser, together with topical benzoyl peroxide and clindamycin, is significantly more effective than topical benzoyl peroxide and clindamycin alone for the treatment of HS. Preliminary review of histopathology suggests the mechanism of action is destruction of the hair follicle. The overall success of the treatment in both clearing pre-existing lesions and preventing new eruptions, coupled with high patient satisfaction, makes the neodymium:yttrium-aluminium-garnet laser a promising treatment advance for this highly disabling condition.

Incidence of nonmelanoma skin cancer in a cohort of patients with vitiligo.

BACKGROUND: Nonmelanoma skin cancer (NMSC) incidence in patients with vitiligo has not been studied. OBJECTIVE: We sought to quantify the incidence of NMSC in patients with vitiligo. METHODS: A cohort of 477 patients with vitiligo and no history of NMSC seen in an outpatient academic center between January 2001 and December 2006 was established. All charts for patients with vitiligo were reviewed for incident NMSC, and histopathology verified. Age-adjusted (2000 US Standard Million) incidence rates were calculated and compared to US rates. RESULTS: Six patients with NMSC were identified; all were Caucasian (>61 years). Age-adjusted incidence rates were: basal cell carcinoma, male 1382/100,000; basal cell carcinoma, female 0; squamous cell carcinoma, male 465/100,000; squamous cell carcinoma, female 156/100,000. Except for basal cell carcinoma in females, all rates were higher than US rates but not statistically significant. LIMITATIONS: Comparison incidence rates from the general patient population during the same time period were unavailable. CONCLUSION: Health care providers should be aware of the possible risk of NMSC in Caucasian patients with vitiligo.

Effects of visible light on the skin.

Electromagnetic radiation has vast and diverse effects on human skin. Although photobiologic studies of sunlight date back to Sir Isaac Newton in 1671, most available studies focus on the UV radiation part of the spectrum. The effects of visible light and infrared radiation have not been, until recently, clearly elucidated. The goal of this review is to highlight the effects of visible light on the skin. As a result of advances in the understanding of skin optics, and comprehensive studies regarding the absorption spectrum of endogenous and exogenous skin chromophores, various biologic effects have been shown to be exerted by visible light radiation including erythema, pigmentation, thermal damage and free radical production. It has also been shown that visible light can induce indirect DNA damage through the generation of reactive oxygen species. Furthermore, a number of photodermatoses have an action spectrum in the visible light range, even though most of the currently available sunscreens offer, if any, weak protection against visible light. Conversely, because of its cutaneous biologic effects, visible light is used for the treatment of a variety of skin diseases and esthetic conditions in the form of lasers, intense pulsed light and photodynamic therapy.