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To test for sensitivity to skincare products, perform a patch test by applying a small amount of the product to a discreet area of skin, like the inside of your arm, and leave it on for 24 hours. Monitor the area for any signs of irritation or allergic reaction, such as redness or itching, before using the product more widely.
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Understanding Skin Tests for Product Sensitivity
Skin tests help identify allergic reactions to various substances, including skincare products. There are two main types of tests: patch tests and allergy skin tests.
Patch Tests
Patch tests are used to determine if specific skincare products cause irritation or allergic reactions. Here’s how to perform a patch test at home:
Select a Test Area
Choose a small, inconspicuous area of skin, like the inside of your arm or the bend of your elbow.
Apply the Product
Use a quarter-sized amount of the product. Apply it thickly, as you would during regular use.
Leave It On
Keep the product on your skin for at least 12 hours. If it’s a wash-off product, follow the usual duration for which you would keep it on.
Monitor for Reactions
Check for any signs of irritation, such as redness, itching, or swelling. If you notice any adverse reactions, rinse the area immediately and discontinue use.
Repeat if Necessary
For more accurate results, consider repeating the test over a few days, as some reactions may take time to develop.
Allergy Skin Tests
These tests are typically performed by healthcare professionals and involve exposing the skin to allergens. They are more comprehensive and can identify reactions to airborne allergens, food, and other substances.
When to Seek Professional Help
If you experience severe reactions or if you have a history of allergies, consult a healthcare provider for a professional allergy skin test. They can provide a safer environment and appropriate care if a reaction occurs.

Seeing your doctor and or an allergist to do a test. I had one and I am very sensitive to a lot of stuff.
Janice, I think you need medical care now. Your scalp is very angry and putting all of that different treatments is not helping you.
If you do anything at all, get baby shampoo and wash your hair, for the scales I’d use baby oil or mineral oil to loosen it. Now is the time to treat your scalp gentle. And see a doctor.