erythropoietic protoporphyria
Definition: a benign disorder of porphyrin metabolism due to a deficiency of ferrochelatase associated with enhanced fecal excretion of protoporphyrin, red-purple urine, and increased protoporphyrin IX in red blood cells, plasma, and feces; characterized by acute solar urticaria or more chronic solar eczema develops quickly on exposure to sunlight; autosomal dominant inheritance.
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Examples: glitazone, GI cocktail, etc.

