Note:

If you have extremely sensitive and allergic skin, it’s always recommended to do a patch test for compatibility prior to using any new products.

How to test for possible allergic reactions: 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