Dr. Dathan Hamann is a world-renowned expert in patch testing for the diagnosis of allergic contact dermatitis. Photopatch testing is the diagnostic test for light-activated allergic contact dermatitis.
The photopatch test is used to detect photoallergic reactions to various antigens that can be found in sunscreens, fragrances, or medicines. Various panels are applied to the patient’s back, and then they are exposed to UVA light.
After the exposure, panels are worn for two days, like standard patch testing, before Dr. Hamann would complete the reading and determine final results. Photo patch testing is the only way to make a definitive diagnosis of photoallergic eczema or photo allergic contact dermatitis.