In the so-called prick test, a drop of a test solution with the corresponding allergen is applied to the skin and then scratched superficially into the skin with a fine needle. After about 20 minutes, the reaction of the skin can then be read. If the test is positive for a particular allergen, a red, itchy wheal will have formed at that spot (similar to contact with a stinging nettle). In this way, several allergens can be tested in one session. The test is also possible in children from kindergarten age. For younger children, a blood test should be done.

In the epicutaneous test, the allergens are applied to the back using prefabricated allergen adhesives and the result is then read after 24 and 72 hours. An allergic reaction manifests itself as in the prick test with a wheal formation on the corresponding skin area.