The following results may occur:
If the skin remains normal, there is probably no allergy to the tested substances. If the skin is changed (reddened, dotted, small blisters), there is a contact allergy – depending on the strength of the reaction – to a pronounced contact allergy.
In the case of a blistering or a weeping inflammation of the skin, one has also to consider the possibility of a toxic contact reaction (not allergic, but directly caused by the chemical effect of the substance); therefore, caution should be exercised when testing undefined (and undiluted) occupational substances (such as drilling and cutting oils).
Through patch testing our Dermatologists can test a relatively large number of potential allergens at the same time. The most common contact allergens are contained in the so-called standard series. In addition to that, there are specially tailored test series for special, job-specific questions (for example for hairdressers, metalworkers, etc.).
If the results are available, the physician discusses the relevance with the patient. The findings may also explain the symptoms and why your Dermatologist initially suggested to test. Furthermore, the importance of perhaps coincidentally detected sensitisations is discussed with the patient and you receive a corresponding allergy pass.