Formaldehyde allergy. Incidence and patch test problems

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Abstract
While patch-test positive formaldehyde allergy occurred in less than 5% of our eczematous patients, when present it was usually clinically significant. In 3 patients formaldehyde allergy caused garment contact dermatitis. Patch tests with formalin require critical evaluation as false-positive irritant responses may occur, especially if 4% or 5% formalin is used. The high incidence of so-called latent formaldehyde allergy found in some studies probably represents an artifact from misinterpretation of irritant reactions. The patch test was 2% formalin is a useful procedure in the investigation of contact dermatitis.