Patient Experience and Quality of Patch Testing on the Legs vs Back

Unlike many different dermatological diseases, a biopsy cannot easily distinguish ACD from irritant contact dermatitis or other forms of chronic dermatitis. Thus, the gold standard for diagnosis is patch testing. During patch testing, allergens are placed on the skin under occlusion using an aluminum disc and tape. When undergoing intensive testing for ACD, as many as 300 patches may be applied to a patient. Therefore, a large area of skin clear of rash is required, most often the back, but patches are frequently applied to the legs as well. Patches are applied by clinic patch technicians. They will proceed with their normal procedures, following the randomization to apply the patches to the appropriate location. Patches will be applied to the skin once, as is the normal standard of care. Patches are applied on day 1 and removed on day 3. Patients continue testing through day 5, though study elements will cease on day 3.