What is Patch Testing?
Signs of a Reaction
A reaction can include redness, itching, swelling, burning, hives, in other words; your skin doesn't like it!
MethodThe crook of your elbow or, if testing dyes or tints for the hair, brows or eyelashes, the skin on the scalp behind your ear are good places to patch test. Make sure the area being used is clean and dry. Apply a small amount of the product to be tested, let it dry and leave it unwashed and undisturbed for 24 hours. If the patch remains clear, you should be good to go.
DisclaimerI am not a health care professional. Be aware that patch testing is not foolproof. If you have concerns regarding a new product, please use common sense and read the ingredient labels. If in doubt, consult your doctor or other qualified medical professional.