Erythropoietic protoporphyria

Erythropoietic protoporphyria (EPP) is a form of porphyria, which varies in severity and can be very painful. It arises from a deficiency in the enzyme ferrochelatase, leading to abnormally high levels of protoporphyrin in the erythrocytes, plasma, skin and liver. The severity varies significantly from individual to individual.