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10-20% of cases are drug-induced (ref. 1).
Treatment includes photoprotection, topical and systemic therapies, chemical peels (chemical used to remove top layers), and laser or light-based therapies (ref. 2).
O Dereure, 2001. Drug-induced skin pigmentation. Epidemiology, diagnosis and treatment. Am J Clin Dermatol 2(4):253
Siddiq Moolla and Yvette Miller-Monthropem 2022. Dermatology: how to manage facial hyperpigmentation in skin of colour. Drugs Context. 11: 2021-11-2