Make the Diagnosis: Mysterious Skin Patches

(MedPage Today) -- Case Findings: A 70-year-old man went to urgent care after becoming concerned about brown hyperpigmented patches on his legs and arms. He also thought that some of his teeth were turning gray, but it had been happening so slowly he wasn't sure. He had been in good health recently, especially after starting on antibiotics last year to treat his rheumatoid arthritis. What is your diagnosis?
Source: MedPage Today Dermatology - Category: Dermatology Source Type: news