Seborrheic dermatitis

Seborrheic dermatitis 

Updated: 02/10/2021

© Jun Wang, MD, PhD

General features
  • Biphasic incidence, 2 weeks to 12 month, and adolescence/adulthood
  • Linked to immunologic abnormalities, and activation of complement
  • Alternating with inactive periods
  • Active in winter and early spring, remissions in summer
  • Usually clinical diagnosis
Pathogenesis
  • Malassezia colonization may be associated
  • Usually normal levels of Malassezia but abnormal immune response
Clinical features
  • Involving scalp, ears, eyebrows, eyelid margin, and nasolabial area, "seborrheic areas"
  • Intermittent, active phases of burning, scaling, and itching
  • Erythematous scaling papules and plaques, sometimes with a greasy yellow appearance are
  • Mild, patchy scaling to widespread, thick, adherent crusts
  • Greasy scaling over red, inflamed skin
Pathological features
Management
  • Treated with anti-inflammatory products
  • Anti-seborrheic shampoos helpful  


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