Disease or Syndrome
pityriasis lichenoides
Subclass of:
Lichenoid Eruptions; Parapsoriasis; Pityriasis
Definitions related to pityriasis lichenoides:
  • A rare cutaneous disorder of unknown etiology that can present either as an acute condition, with multiple papular lesions which become vesicular and necrotic (pityriasis lichenoides et varioliformis acuta) or chronic, with small, scaling papules (pityriasis lichenoides chronica).
    NCI
    U.S. National Cancer Institute, 2021
  • A subgroup of PARAPSORIASIS itself divided into acute and chronic forms. The acute form is characterized by the abrupt onset of a generalized, reddish-brown, maculopapular eruption. Lesions may be vesicular, hemorrhagic, crusted, or necrotic. Histologically the disease is characterized by epidermal necrolysis. The chronic form shows milder skin changes with necrosis.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • Pityriasis lichenoides is a clonal T-cell disorder that may develop in response to foreign antigens (eg, infections or drugs) and may be associated with cutaneous T-cell lymphoma. Treatment may include various topical and oral drugs.
    Merck Manuals
    Merck & Co., Inc., 2025
  • Pityriasis lichenoides is a rare cutaneous disorder of unknown etiology. Pityriasis lichenoides encompasses a spectrum of clinical presentations ranging from acute papular lesions that rapidly evolve into pseudovesicles and central necrosis (pityriasis lichenoides et varioliformis acuta or PLEVA) to small, scaling, benign-appearing...
    Medscape
    WebMD, 2025
  • Pityriasis lichenoides (PL) is a skin condition characterized by small, raised pink spots that tend to come together in groups. It is not contagious. There are two main types of PL: an acute form called pityriasis lichenoides et varioliformis acuta (PLEVA), and a milder, longer-lasting form called pityriasis lichenoides chronica (PLC)....
    NIH Genetic and Rare Diseases
    National Center for Advancing Translational Sciences
  • Pityriasis lichenoides is an uncommon, acquired, idiopathic skin condition. It is a challenging disorder to diagnose, categorize, and treat due to its varied presentation and uncertain course. Pityriasis lichenoides manifests as diffuse polymorphic, papulosquamous dermatitis that varies in severity, temporal onset and development, and...
    Epocrates
    Athenahealth, Inc., 2019
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