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Marsha has developed a contact dermatitis on her face, neck, and arms. she has developed such reactions in the past but has been unable to identify the causative agent. she now goes to see the dermatologist for allergy testing. a patch test is done. a patch test is performed by:

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CrypticGeek
A patch test is performed by applying allergens to the patches and then placing on the skin. During a patch test, about 20 to 30 types of substance extracts could come into contact with your skin. These substances are mostly the usual suspects for contact dermatitis.



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