ABSTRACT
Vitiligo is an acquired depigmentary disorder causing a progressive reduction in melanocyte number that shows an incidence rate of 0.5% to 2% worldwide, although it may reach 8.8% in Indians. Milky/bright white structureless areas with sharp and convex margins are the main dermoscopic findings in vitiligous lesions, yet dermoscopic features of vitiligo in dark-skinned patients classically vary according to the disease stage. Idiopathic guttate hypomelanosis (IGH) is a benign, asymptomatic hypopigmented dermatosis in which chronic exposure to ultraviolet rays and senile degeneration would play a relevant pathogenetic role. Progressive macular hypomelanosis (PMH) is an acquired disorder causing hypopigmentation thought to be related to Propionibacterium acnes growth in the pilosebaceous unit. Achromic nevus (AN), also known as nevus depigmentosus, and hypomelanosis of Ito (HI) are two forms of cutaneous mosaicism resulting in localized hypopigmented skin lesions, with the latter possibly associated with extracutaneous involvement.
