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2. Patch test - Wikipedia

   en.wikipedia.org/wiki/Patch_test

   A patch test relies on the principle of a type IV hypersensitivity reaction.. The first step in becoming allergic is sensitization. When skin is exposed to an allergen, the antigen-presenting cells (APCs) – also known as Langerhans cell or Dermal Dendritic Cell – phagocytize the substance, break it down to smaller components and present them on their surface bound major histocompatibility ...

3. Skin allergy test - Wikipedia

   en.wikipedia.org/wiki/Skin_allergy_test

   Patch test: applying a patch to the skin, where the patch contains the allergen; If an immuno-response is seen in the form of a rash, urticaria , or anaphylaxis it can be concluded that the patient has a hypersensitivity (or allergy) to that allergen. Further testing can be done to identify the particular allergen. [citation needed]

4. Allergy test - Wikipedia

   en.wikipedia.org/wiki/Allergy_test

   The chemicals included in the patch test kit are the offenders in approximately 85–90 percent of contact allergic eczema and include chemicals present in metals (e.g., nickel), rubber, leather, formaldehyde, lanolin, fragrance, toiletries, hair dyes, medicine, pharmaceutical items, food, drink, preservative, and other additives.

5. Everything You Need to Know About Allergy Patch Testing - AOL

   www.aol.com/news/everything-know-allergy-patch...

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6. A ‘peanut patch’ desensitized toddlers with peanut allergies ...

   www.aol.com/peanut-patch-desensitized-toddlers...

   The late-stage trial, which involved more than 200 children ages 1 to 3 with peanut allergies, found that after wearing the experimental patch around 22 hours a day for a year, 67% were able to ...

7. Nickel allergy - Wikipedia

   en.wikipedia.org/wiki/Nickel_allergy

   Nickel allergy is typically diagnosed by patch testing – applying a patch with 2.5% (in North America) or 5% (in Europe) nickel sulfate to the upper back and looking for irritation on the skin. [2] As with other causes of allergic contact dermatitis, patches containing several common allergens are typically applied to the back for 48 hours ...