Dermatitis

 

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

includes:

  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

 

Tx:

irritant removal

topical corticosteroids

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