A contact allergy can be determined using the so-called "epicutaneous test". The test substances – potential allergens – are applied to plasters which are then applied to the patient’s back. The plasters are removed after 48 hours, and the skin’s reaction is tracked for the next 24 hours. Itching and outbreaks of eczema in the test area indicate a positive result.

During an epicutaneous test, patients should avoid physical activity such as swimming, hard physical labor, or sauna – these activities can all influence test results. Patients should also avoid exposure to strong ultraviolet light, i.e. in the solarium, during the testing.

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