Patients who do not respond to these measures should undergo patch testing to determine whether another antigen is causing or provoking the dermatitis. Without the use of patch testing, the allergen will remain unknown and the dermatitis will persist. Not infrequently, patients are found to be allergic to a fragrance or preservative that is an ingredient in one of their personal care products. Once they stop using the product, the dermatitis finally resolves.

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