Patch Test: What is it and Why is it so important?

Patch Test: What is it and Why is it so important?

17 May 2021
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​What is Patch Test?

 

A patch test or skin allergy test is helpful in determining whether a new skin care product works well with your skin or not. It’s a simple test that helps you check for a skin allergy. You can do a simple and effective patch test at home.

Patch tests can be done for any new skin care product you’d like to use. Creams, lotions, facial products, hair dyes, oils and serums, shampoos and conditioners, moisturizers, toners and eye cream can all be tested for skin allergy. An allergic reaction commonly occurs with products having synthetic dyes and fragrances, parabens, preservatives, sulfates and high concentrations of acids. In addition, cosmetics with herbal ingredients or essential oils may also cause allergy in susceptible individuals. In comparison to synthetic ingredients though, the incidence could be much less. 

A Patch Test Is Not A Lab Test!

 

This simple, at-home patch test should not be confused with patch tests that are done at laboratories. Patch tests done at laboratories or skin clinics are scientific methods of investigation. In a laboratory patch test, various patches which contain different allergens are applied onto the skin on the back or arm for 48 hours or more. A physician is present or consulted with to see if you are allergic to any potential allergens. Those undergoing a laboratory patch test are under constant supervision.

 

Precautions...

  • Take a small amount of the product you are testing. Apply it on the inner area of your upper arm near the crook of your elbow. This part of the body is a sensitive area and a good place to perform a patch test. If any allergic reaction occurs, it will not be very noticeable here. After applying some amount of product to the skin, cover it with a bandage.
  • You can also try a patch test on other body parts if you want to. You can test on the inner side of the wrist, the inner thigh, back of the earlobe or side of the neck.
  • Before applying the product make sure the skin is clean and dry. Do not apply the new product if something has already been applied to the skin. This can alter test results.
  • Wash the area properly and dry it thoroughly before applying the product you’re going to test.
  • If you’re applying the product after a hot shower then wait 15 minutes before doing so.
  • Leave the patch test on your skin for 24 hours at a minimum.
  • If you are allergic to any of the ingredients of the product then a reaction will appear. Allergic responses include itching, redness, swelling, a burning sensation, rash or stinging sensation. Usually the reaction will occur within 24 hours of application.

 

A Patch Test For Sensitive Skin

 

People who have very sensitive skin or a past history of allergic skin reaction should do this patch test before trying any new skin care product or before switching from one brand to other. With a patch test, you may avoid an allergic reaction. A patch test is in no way painful so do not be afraid to perform this test at home.

An irritant reaction on other hand is an instant reaction which occurs in some people. This might be mild itching, mild redness or a mild stinging sensation after the use of a new product for the first time. An irritant reaction is very mild and goes away within ten minutes. This reaction does not occur when the product is used again. Irritant reactions do not involve the immune system like an allergic reaction does. It can however exacerbate skin conditions like eczema.

A Patch Test For Mild Redness

 

If a product contains glycolic acid, lactic acid or salicylic acid, then there are chances of mild redness but it should subside within 10-15 minutes. A moisturizer can be used to lessen the redness. Do not confuse mild redness with an allergic reaction. Still if there is irritation, discontinue use and consult your health care provider.

A Patch Test For Breakоuts

 

People with oily skin and acne-prone skin can experience breakouts with products like coconut oil, coconut butter, cocoa butter and isopropyl palmitate. If you are performing a patch test to see if a product will make you break out, then follow these steps. A break out means clogged pores or blemishes which usually can not be seen after only one use. Here’s what you can do.

  • Apply the product directly over the cheek or chin area. These areas are more prone to blemishes because they have more oil producing glands
  • Apply the same product onto the same area daily for 7-10 days.
  • A product-related break out will occur within this time frame.