Acute porphyrias include, in order of decreasing prevalence: Acute intermittent porphyria (AIP) Variegate porphyria (VP) Hereditary coproporphyria (HCP) Delta - aminolevulinic acid dehydratase (ALAD) - deficiency porphyria (exceedingly rare) Patients with variegate porphyria and hereditary coproporphyria, with or without neurovisceral symptoms, may develop bullous eruptions especially on the hands, forearms, face, neck, or other areas of the skin exposed to sunlight.