Small plaque parapsoriasis

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Small plaque parapsoriasis is one of the two major forms of parapsoriasis. The other form is large plaque parapsoriasis. Both of them are characterized by the presence of erythematous scaly patches of varying size, especially on the trunk, and sometimes on the limbs. The lesions are usually accompanied by mild pruritus. The small-plaque type, though, is considered a benign condition whereas the large-plaque type could be a premalignant dermatosis and poses a high risk of progressing to mycosis fungoides. Small plaque parapsoriasis is characterized by monomorphic eruptions. The patches are regularly shaped (round to oval), covered by fine scale and diameter ranging from 2 to 6 cm. It occurs spontaneously or for which the cause is unknown. Two types occur: xanthoerythrodermia perstans (characterized by yellowish skin lesions) and digitate dermatosis (characterized by finger-like lesions distributed symmetrically on the sides of the torso). Abbreviation: SPP. Synonym: digitate dermatosis.


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