<unk>  of the skin may occur as a consequence of<unk>  administration, and the mechanism may be postinflammatory hyperpigmentation in some cases, but frequently is related to actual deposition of the offending<unk>  in the skin.The incidence of this change varies, and depends on the type of medication involved. Some of the most common<unk> s involved are NSAIDs, antimalarials, psychotropic<unk> s, Amiodarone, cytotoxic<unk> s, tetracyclines, and heavy metals such as silver and gold (which must be ingested, not just worn).
Drug-induced pigmentation
Chemotherapy-induced hyperpigmentation
Neurocutaneous melanosis
Phakomatosis pigmentokeratotica
Melanocytic nevus
Riehl melanosis
Smoker's melanosis
Congenital melanocytic nevus