title: Ring-shaped positive allergic patch test reactions to allergens in liquid vehicles.
abstract: In recent years, we have observed several "ring-shaped" positive allergic patch test reactions to allergens dissolved in a liquid vehicle, a more intense response at the periphery of the site of application than in the central part. The occurrence of such reactions was evaluated for formaldehyde, Kathon CG, hydrocortisone and hexamidine diisethionate. Possible explanations for such reactions include pressure and/or a capillary effect.
authors: Unit of Occupational Dermatology, Louvain University, Brussels, Belgium.
authors: J M
authors: JM
authors: Lachapelle
authors: D
authors: D
authors: Tennstedt
authors: A
authors: A
authors: Fyad
authors: M L
authors: ML
authors: Masmoudi
authors: H
authors: H
authors: Nouaigui
mesh_terms: D000485:Allergens / Q000008:administration & dosage* / Q000276:immunology; D000431:Ethanol / Q000494:pharmacology; D006801:Humans; D010328:Patch Tests / Q000379:methods*; D014677:Pharmaceutical Vehicles; D011312:Pressure; D012882:Skin Tests / Q000379:methods*; D014867:Water / Q000494:pharmacology
chemical_list: D000485:Allergens; D014677:Pharmaceutical Vehicles; D014867:Water; D000431:Ethanol