[Side effects, complications and contraindications of patch-tests].

The side effects of patch-tests are usually mild if testing is done properly, but they can interview with the test results and interpretation. The most troublesome complication is an indication by the test of active allergen-specific sensitization. The associated contraindications are dependent on the patient's status (immunodepression, pregnancy, ongoing eczema) and on the allergen in question (unknown, irritant, sensitizing).