Rash Evaluation Test

A rash evaluation is a test to find out what is causing a rash. Your provider will ask about your medical history and examine your skin. They may also order additional tests like a patch test, skin culture, or skin biopsy.

The two main types are allergic contact dermatitis and irritant contact dermatitis. Allergic contact dermatitis happens when your immune system reacts to a normally harmless substance. Irritant contact dermatitis happens when your skin is irritated by a substance.

Common causes include poison ivy and related plants, cosmetics, fragrances, jewelry metals like nickel, and rubber including latex.

Common causes include household products like detergents and drain cleaners, strong soaps, pesticides, nail polish remover, and body fluids like urine and saliva.

If you had a patch test and have itchy, red bumps or swelling at any of the testing sites, it means you are probably allergic to the substance tested.