The Patch Test and Phototherapy Clinic

Suite 2 Harmont House, 20 Harley Street, London. W1G 9PH

Patch Testing is a specialised procedure, which determines whether a specific chemical or material is responsible for causing an allergic contact dermatitis. However, it should be noted that this procedure does not test for food or latex allergies.


 A low concentration of potential allergens are applied to the skin and left in place for 48 hours. After this time, the tests are removed and the skin is examined to see if any reactions have appeared. Additional tests may be applied to help confirm doubtful reactions and it may be necessary to shine light on some of the tests if a sun induced reaction (eg to sunscreen) is suspected. A final reading is taken after a further 48 hours as delayed reactions are common and the results discussed with you.

The clinic offers full verbal/written information and advice concerning all positive allergens.