Dermatitis: inflammation of the skin


Allergic and Hypersensitivity Dermatoses

  • involve inflammatory response to multiple exogenous and endogenous agents
  • characterized by epidermal edema with separation of epidermal cells


  1. irritant contact dermatitis
  2. allergy contact dermatitis (latex sensitivities and allergies increasing in prevalence)
  3. atopic and nummular eczema
  4. urticaria
  5. drug-induced skin eruptions


Contact and Allergic Dermatitis

  • common inflammation of the skin


  1. Allergic Contact Dermatitis
  • cell mediated type IV hypersensitivity from allergen sensitivity
  • eg poison ivy
  • mild erythema with edema to vesicles or large bullae
  • location and pattern help determine etiology


  1. Irritant Contact Dermatitis
  • chemical, mechanical, environmental etiology
  • no allergen can be identified


4 types of irritant contact dermatitis

  1. subjective – no clinical manifestations, yet burning and stinging felt
  2. acute – rxns from single exposures
  3. chronic – due to continuous irritant exposure, even after iritant removal rxn may continue for yrs
  4. chemical – due to chemical irritants



irritant removal

topical corticosteroids


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