Dermatology Book

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Annular Lesion

Aka: Annular Lesion, Annular Ring
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  1. Definition: Ring-shaped lesion
    1. Circular or oval Macule or patch
    2. Erythematous outer border
    3. Central clearing
  2. Causes
    1. Tinea Corporis or Ringworm (most common adult cause)
    2. Pityriasis Rosea
    3. Granuloma Annulare
    4. Sarcoidosis
    5. Leprosy (Hansen's Disease)
    6. Urticaria
    7. Subacute Cutaneous Lupus Erythematosus
      1. Lesion seen in Systemic Lupus Erythematosus
    8. Erythema Annulare Centrifugum
    9. Erythema Chronicum Migrans (Lyme Disease)
    10. Erythema Multiforme
    11. Psoriasis
    12. Nummular Eczema
    13. Annular Lichen Planus
  3. References
    1. Hsu (2001) Am Fam Physician 64(2):289-96
    2. Nopper (1998) Pediatr Ann 27:136-48

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