Diffuse hyperpigmentation is seen in all except: September 2007: (A) Addison's disease, (B) Cushings syndrome, (C) Porphyria cutanea tarda, (D) Phenylketonuria
Answer is D. Ans. D: Phenylketonuria Common causes of diffuse hyperpigmentation: Addison's disease Porphyria cutanea tarda Cushing's syndrome Hemochromatosis Phaeochromocytoma Biliary cirrhosis High dose ACTH therapy Phenylketonuria results in hypopigmentation