Nevus depigmentosus: review of a mark of distinction.

Nevus depigmentosus (ND), also known as nevus achromicus or achromic nevus, is an uncommon congenital hypomelanosis of the skin that is often characterized as being nonprogressive and having serrated borders. It needs to be distinguished from other hypopigmented skin conditions such as nevus anemicus, hypomelanosis of Ito, Fitzpatrick patches (ash leaf spots) of tuberous sclerosis, vitiligo, indeterminate leprosy, and pigment demarcation lines. Treatment may be desired for aesthetic and possible psychosocial considerations. We review and update knowledge about ND and its simulants.

Autologous noncultured melanocyte-keratinocyte transplantation in stable vitiligo: A randomized comparative study of recipient site preparation by two techniques.

BACKGROUND: Accurate preparation of recipient area is a critical step in melanocyte-keratinocyte transplantation procedure for vitiligo. It is an important potential step for adaptation in the quest to achieve better results and ablative lasers potentially offer excellent precision over margin and depth control in achieving that. OBJECTIVE: To compare between the two techniques used for recipient site preparation: Er:YAG laser ablation and mechanical dermabrasion for melanocyte-keratinocyte transplantation procedure in terms of re-pigmentation achieved and adverse effects seen. METHODS: A randomized comparative trial was performed among 32 patients of stable vitiligo undergoing melanocyte-keratinocyte transplantation procedure. In Group A (n = 15), recipient site preparation was done with Er:YAG laser, and in Group B (n = 17), it was done with a motorized dermabrader. Patients of both groups were objectively assessed for re-pigmentation at 1, 3 and 6 months. RESULTS: A total of 253.696 cm2 of depigmented surface was operated upon and re-pigmentation of 125.359 cm2 (49.4%) was achieved. On comparison between two groups, no statistical difference was found with respect to total re-pigmentation achieved (Group A: 54.67% vs Group B: 48.841%, P = 0.663) and grades of re-pigmentation achieved (P = 0.796). Occurrence of adverse events was also statistically similar in both the groups. CONCLUSION: This study did not reveal any statistically different outcome (in terms of re-pigmentation and adverse effects) between the two methods of recipient site preparation - motorized dermabrasion and Er:YAG ablation. LIMITATIONS: This study is small and larger studies are needed to ascertain the benefit of Er:YAG for recipient site preparation. Future studies may also ascertain variables such as time taken to prepare the recipient area, nature of bleeding, postoperative healing, difficulties in specific area, cost of the procedure, patient comfort and ease of the surgeon, rather than comparing the re-pigmentation alone.

Keratinocyte-melanocyte graft technique followed by PUVA therapy for stable vitiligo.

BACKGROUND: Various surgical procedures for correcting stable vitiligo exist but these have their own limitations. Autologous, non-cultured, non-trypsinized, melanocyte plus keratinocyte grafting is a new and simple method of vitiligo surgery. OBJECTIVE: The study aimed to evaluate efficacy of a new grafting technique in vitiligo patches. METHODS: Eighteen vitiligo patches underwent this procedure. The upper layer of epidermis was removed by superficial dermabrasion using a dermabrader micromotor until the epidermis appeared wet and shiny. Then, antibiotic ointment was applied and dermabrasion was continued up to the whitish area of the upper dermis. The paste-like material (ointment with entangled epidermal particles) was collected and spread over the dermabraded recipient site. RESULTS: Pigmentation usually started at 4-6 weeks. Complete uniform pigmentation took 16-20 weeks. CONCLUSION: For smaller vitiligo patches this method gives cosmetically acceptable results. It is easy to perform and does not require specific laboratory setup.

A study of autologous melanocyte transfer in treatment of stable vitiligo.

BACKGROUND: Replenishing melanocytes selectively in vitiliginous macules by autologous melanocytes is a promising treatment. With expertise in culturing melanocytes, it has now become possible to treat larger recipient areas with smaller skin samples. AIM: To study the extent of repigmentation after autologous melanocyte transplantation in patients with stable vitiligo. METHODS: The melanocytes were harvested as an autologous melanocyte rich cell suspension from a donor split thickness graft. Melanocyte culture was performed in selected cases where the melanocyte cell count was insufficient to meet the requirement of the recipient area. These cells were then transplanted to the recipient area that had been superficially dermabraded. RESULTS: An excellent response was seen in 52.17% cases with the autologous melanocyte rich cell suspension (AMRCS) technique and in 50% with the melanocyte culture (MC) technique. CONCLUSION: Autologous melanocyte transplantation can be an effective form of surgical treatment in stable but recalcitrant lesions of vitiligo.