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Erythema dyschromicum perstans (EDP), also called ashy dermatosis, is a rare acquired and chronic dermatosis, characterized by asymptomatically and progressively hyperpigmented macules of various size on the trunk, face, and extremities.1 Its exact cause is unknown, and its treatment remains controversial.1 We describe a 48-year-old Chinese man with EDP who was successfully treated with low-dose isotretinoin over a period of 7 years.
Wang F, Zhao Y, Wang Z, Liu J, Luo D. Erythema Dyschromicum Perstans Response to Isotretinoin. JAMA Dermatol. 2016;152(7):841-842. doi:10.1001/jamadermatol.2015.6185