Cutaneous porphyrias do not affect the nervous system. Instead, they cause skin symptoms, usually as a result of sun exposure. There are several types of cutaneous porphyrias: porphyria cutanea tarda (PCT), erythropoietic protoporphyria (EPP), and x-linked protoporphyria (XLP). Congenital erythropoietic porphyria (CEP) and hepatoerythropoietic porphyria (HEP) occur in childhood.

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