Yes, before patch testing you should:
- Avoid oral or topical steroids 2 weeks prior to testing
- Be free from hair, acne, scars, or dermatitis on test area
- Avoid sun exposure 3 weeks prior to testing
- Most importantly, make sure that you give your doctor a detailed history of your condition. Let him/her know when it first appeared, all of the areas on your body that are affected, any changes in your use of cosmetic, hygiene, or cleaning products, or changes in your work place, etc.