<prompt> Diffuse hyperpigmentation is seen in all except: September 2007Addisons diseaseCushings syndromePorphyria cutanea tardaPhenylketonuria  <response>: Ans. D: Phenylketonuria Common causes of diffuse hyperpigmentation: Addisons disease Porphyria cutanea tarda Cushings syndrome Hemochromatosis Phaeochromocytoma Biliary cirrhosis High dose ACTH therapy Phenylketonuria results in hypopigmentation 