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Porphyria cutanea tarda is the most common subtype of porphyria. [1] The disease is named because it is a porphyria that often presents with skin manifestations later in life. The disorder results from low levels of the enzyme responsible for the fifth step in heme production. Heme is a vital molecule for all of the body's organs.
Porphyria Cutanea Tarda (PCT): PCT is the most common form of porphyria, with an estimated prevalence of 1 to 2 cases per 10,000 individuals in the general population. It predominantly affects adults, with a higher prevalence in men than in women.
Erythropoietic protoporphyria (or commonly called 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 red blood cells (erythrocytes), plasma, skin, and liver. [2]
Variegate porphyria, also known by several other names, is an autosomal dominant porphyria [3] that can have acute (severe but usually not long-lasting) symptoms along with symptoms that affect the skin. The disorder results from low levels of the enzyme responsible for the seventh step in heme production.
Acute intermittent porphyria (AIP) is a rare metabolic disorder affecting the production of heme resulting from a deficiency of the enzyme porphobilinogen deaminase. It is the most common of the acute porphyrias .
Nearly all cases of porphyria cutanea tarda [18] exhibit blister formation on the skin within 2–4 days of light exposure. Variegate porphyria [19] and hereditary coproporphyria [20] can also exhibit symptoms of light-induced blisters. [18]
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