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pityriasis lichenoides chronicaAn uncommon, idiopathic dermatosis that primarily affects younger patients (under age 30), which is characterised by waves of erythematous, scaly papules that may persist for months.
Unknown; thought to be a hypersensitivity reaction to viruses—e.g., EBV, adenovirus, parvovirus B19.
Various modalities have been tried, including phototherapy (UV, solar), topical steroids and antibiotics.
Scab formation resembling that of psoriasis.
See also: parakeratosis