Whenever you use a new product, I suggest you do a patch test. If you have extremely allergic skin, it’s always recommended to do a patch test for compatibility prior to using any new products.
How to test for a possible allergic, rash-like reaction: Apply a small amount of product to the skin and leave on for 24 hours. The side of the neck is a good starting point for true compatibility because it’s thinner and generally more reactive. The idea is that if it can be tolerated on your neck, then you can feel confident that it will be okay on the face. Also, should you encounter a negative reaction such as an itchy, red rash; you might want it to appear on the neck rather than on your face.
If your sensitivity is more related to products causing bumps or blemishes, then you’ll want to patch test on the chin. There are a number of oil glands there so if a product doesn’t break you out there, then it’s highly unlikely it would break you out elsewhere on your face. (Although, there are always exceptions because…every person’s skin is just so different.)
