ABSTRACT
Lichen planus pigmentosus (LPP) is an uncommon variant of lichen planus that is mainly seen in Indian patients but also occurs not rarely in Latin Americans and very darkly pigmented subjects. Dermoscopic examination of LPP involving the face mainly shows pigmented dots typically arranged around follicular and eccrine ostia. Focal brown structureless areas with ostial sparing are also visible. Ashy dermatosis is a slowly progressive pigmentary skin condition mainly affecting young adults. Dowling-Degos disease (DDD) is an autosomal dominant genodermatosis with variable penetrance typically arising during adulthood. Dermoscopy of hyperpigmented macules of DDD in skin of colour reveals a central hypopigmented area with surrounding irregular brownish projections or accentuated reticular pigment pattern. Macular amyloidosis and lichen amyloidosis are the main forms of primary cutaneous amyloidosis, histologically characterized by deposition of amyloid in the papillary dermis in previously healthy skin without any internal organ deposition.
