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Patch testing is used to identify allergens that may be causing outbreaks of contact dermatitis - a localized rash or irritation of the skin where allergen(s) came in contact.
Patch tests are used in patients with dermatitis to find out whether their skin condition may be caused by, or aggravated by, a contact allergy. Patch tests are not the same as skin prick tests, which are used to diagnose hay fever allergy (house dust mite, grass pollens and cat dander) or other environmental or food allergies. Skin prick tests have very limited value for patients with skin rashes. Identifying allergens, so they can be avoided, is the only way to prevent outbreaks of contact dermatitis.
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