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Latest Edit: Iva 2012-08-03 (EDT)

A crust (also commonly referred to as a scab) is a secondary skin lesion formed from cellular remnants and dried serum.[1]

Common conditions associated with crust formation include:

  • impetigo
  • tinea capitis
  • pemphigus foliaceus

Check out other secondary skin lesions


  1. Habif Thomas P., et al. (2005) Skin Disease, Diagnosis and Treatment Mosby.