Current understanding of lichen planus pigmentosus, erythema dyschromicum perstans (ashy dermatosis), and idiopathic eruptive macular pigmentation

Abstract

Lichen planus pigmentosus, erythema dyschromicum perstans and idiopathic eruptive macular pigmentation are the three most commonly accepted subtypes of acquired dermal hyperpigmentary disorders. While some patients fit easily into one of these subtypes, others do not. Overlapping features of several subtypes may also be seen in the one patient. This paper covers these three entities in detail and highlights the diagnostic and classification challenges.

Keywords

• Erythema dyschromicum perstans
• hyperpigmentation
• idiopathic eruptive macular pigmentation
• lichen planus pigmentosus