Patch testing is not advisable if you: • are pregnant or breastfeeding • have extensive eczema on your back • have been exposed to the sun or have used a sun bed over the previous 2 weeks • have recently applied an artificial tan • are using moderate or high dose oral steroids It is not possible to apply test patches if the skin on your back is scratched, sun burnt, has a rash or excessive hair growth. If you do have excessive hair on your back, please have the area shaved before your appointment. Avoid using antihistamines for 48 hours before and during the patch testing period as this would reduce any visible reaction to the allergens.