How to Patch Test a New Skincare Product

Before using a new leave-on product across your face or body, apply a small amount to a discreet patch of skin according to the product directions. Repeat as directed over several days and watch for redness, itching, swelling, or discomfort. A patch test cannot guarantee that a product will never cause a reaction, but it can be a sensible first check.

Do not patch test on broken or already irritated skin. Rinse the area and stop using the product if a reaction develops. Seek medical advice for severe symptoms or a reaction that does not settle. Keep the product packaging so you can share the ingredient list with a healthcare professional if needed.