title: Unusual skin pigmentation from long-term methacycline and minocycline therapy.
mesh_terms: D000368:Aged; D006801:Humans; D008297:Male; D008690:Methacycline / Q000009:adverse effects*; D008911:Minocycline / Q000009:adverse effects*; D010859:Pigmentation Disorders / Q000139:chemically induced* / Q000473:pathology; D012867:Skin / Q000473:pathology; D013754:Tetracyclines / Q000009:adverse effects*
chemical_list: D013754:Tetracyclines; D008911:Minocycline; D008690:Methacycline