Value of Patch Tests in Dermatology

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Abstract
The patch test has assumed its rightful place as a useful tool in the diagnosis of suspected allergic contact dermatitis (eczema). The original method of Jadassohn and Bloch has undergone modifications designed to insure continuous contact between the allergen and the epidermis (pressure method of Fernström) and use of transparent receptacles for contact with liquids and gases.2 Employment of patch-testing has varied greatly. In the late 20's and early 30's, routine patch-testing to a standard group of allergens was practiced by many institutions, but, at present, testing is usually to materials which may have been encountered in the patients' occupations or activities. Preemployment patch-testing and patchtesting to articles of clothing and various cosmetic or therapeutic preparations to be used on the skin are discussed by Schwartz et al.3Ayres4has suggested that pretreatment patch tests be made on patients who present

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