Allergic Contact Dermatitis
A 33-year-old male visited Primary Care after developing an erythematous and edematous macular rash in the periorbital area. The rash was diagnosed as allergic contact dermatitis (ACD). ACD is a T cell-mediated type IV hypersensitivity reaction that occurs after re-exposure to an allergen. Nickel, neomycin, thimerosal, formaldehyde, and fragrance mix are among the most common contact allergens. ACD is associated with occupational exposure to allergens and has a higher prevalence among salon workers, metal workers, and health care professionals. ACD may be treated with topical corticosteroids; however, allergen avoidance is the safest way to avoid recurrence.
KeywordsAllergy Occupational dermatitis Allergic contact dermatitis Skin allergy Allergen Irritant Edema Type 4 hypersensitivity Type IV hypersensitivity T Cell T Cell-mediated Allergic reaction Nickel Formaldehyde Thimerosal Cosmetics Patch testing Patch test Corticosteroid Prednisone
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