<prompt> True about vitiligo are all except:Surgical treatment is indicated if medical treatment failsLeucotrichia is associated with good prognosisAutoimmune conditionSkin biopsy specimen shows abscence of melanocytes.  <response>: VITILIGO -Autoimmune disorder -Skin biopsy specimen shows absence of melanocytes. Poor prognostic factors: Leucotrichia Long standing type Lesions over bony prominences Acrofacial -Surgical treatment is indicated if medical treatment fails and disease is stable for 1 year. - Modalities : Skin grafting Non-cultured autologous melanocytic transfer Cultured autologous melanocytic transfer. 