How to care for your skin during skin allergy testing. What to Expect. We have applied strips of tape with small amounts of suspect substances onto your back.
Patch testing is performed by applying strips of tape to your skin, usually on your back. These tape strips have suspected allergens (chemicals to which a patient.
applying patches over nevis, scars, or tattoos. Typically, patch tests are applied in strips from left to right on the patient's back, beginning with the upper left back.