ABSTRACT
A diagnosis of allergic contact dermatitis is common and at times fairly clear; though determining the source of the allergen may be more difficult. Certain allergens have classical presentations on the trunk. Nickel is one of the most common allergens, and it is often the source of contact dermatitis on the trunk. Preservatives and fragrances are the most common allergens in personal hygiene products such as soaps and moisturizers, as well as in laundry detergents and fabric softeners. Hexavalent chromium and azo dyes have been identified as allergens present in leather chair and sofa backs, while Japanese lacquer can be the responsible allergen on wood surfaces. An allergy to deodorants will also present in a classical distribution in the axilla. One trick that patients with nickel allergies can try is to cover exposed metal with clear nail polish to prevent exposure to the nickel-containing surface.
