Allergy Patch Test

The allergens applied on patient’s skin are tailored to the individual. A standard baseline series of allergens is applied, together with other specific allergens relevant to the individual. Examples of substances that can cause allergic contact dermatitis are nickel, fragrances, preservatives, hair dyes, etc.

After the test, you’ll go back to the doctor a couple of times where the reaction under each patch is evaluated and rated. The first appointment will probably be 48 hours after the application and your doctor will mark the area with a waterproof pen. Subsequent appointments at 2-to-3-day intervals will be necessary to see if there has been any change, so you’ll know if the reaction was immediate or delayed. The whole process takes about 3 to 4 visits. But it’s worth it if you do find out what pesky allergen is causing your symptoms.