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This report describes a surprising association between topical tretinoin and neurotoxicity. A 39-year-old woman presented with complaints of headache, memory loss, and unsteadiness that interfered with simple daily activities. Examination showed truncal ataxia and dysarthria. The patient was suffering from untreated depression and chronic hepatitis C. Her liver enzymes were elevated by 30%, consistent with mild hepatitis, but her EEG was normal. The cause of the neurologic disease was unclear until the patient revealed that she had borrowed a friend's topical tretinoin (0.025%) to treat her own acne about four to six weeks before she visited the neurologist. She had been using large amounts of cream and developed dermatitis on her face. Two…