PhotopatchTest
PhotopatchTest is a diagnostic procedure used to identify contact allergies to light-sensitive substances. It is a variation of the standard patch test, which is commonly used to assess reactions to chemicals on the skin. In a photopatch test, small amounts of suspected allergens are applied to the skin, typically on the back, using adhesive patches. These patches are left in place for a period, usually 24 to 48 hours. After removal, the skin is examined for any signs of reaction, such as redness, itching, or blistering.
The key difference in a photopatch test is the subsequent exposure to ultraviolet (UV) light. After the
Photopatch testing is indicated when a patient presents with a skin rash that appears or worsens after