Allergic contact dermatitis caused by motorcycle heated grips.

A 32-year-old non-atopic man presented with a history of pruritic, sharply demarcated erythematous and vesicular eruption of the palms and palmar sides of the fingers. The lesions had started during winter, 2months after the use of a new motorcycle, equipped with heated grips (Fig. 1). The dermatitis recurred every time that the patient switched on the warm hands controller, and improved with the use of gloves and topical corticosteroids. Patch tests were performed with the Italian Society of Allergological, Occupational and Environmental Dermatology (SIDAPA) baseline patch test series, and read according to ICDRG recommendations. Allergens were provided by F.I.R.M.A. (Florence, Italy), applied on the patient’s back with van der Bend® Square Chambers (van der Bend, Brielle, The Netherlands), and fixed with MediporeTM tape (3M Company, Minneapolis, MN, USA); readings were performed on day (D) 2, D4, and D5. Positive (++) reactions to IPPD 0.1% pet. were observed