Signs and Tests

The diagnosis is primarily based on the skin appearance and a history of exposure to an irritant or allergen.

Allergy testing with skin patches may isolate which of suspected allergens is causing the reaction. According to the American Academy of Allergy, Asthma, and Immunology, "Patch testing is the gold standard for contact allergen identification." Patch testing is used for patients who have chronic, recurring contact dermatitis. It requires three office visits and must be done by a clinician with detailed experience in the procedures and interpretation of results. Patients should bring suspected materials with them, especially if they have already tested those materials on a small area of their skin and noticed a reaction.

Other tests may be used to rule out other possible causes, including skin lesion biopsy or culture of the skin lesion (see skin or mucosal biopsy culture).

Ency. home > Disease > C > Contact dermatitis

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