Trying a product on a small area can help you notice a reaction before applying it widely. This is not medical patch testing and cannot rule out every allergy. Use the product directions and test one new product at a time.
Check the product and area
Read intended-use, rinse-off and warning information. Do not test on broken or already irritated skin. Prescribed treatments and strong products may have specific directions that take priority over a general cosmetic routine.
Keep your other products familiar and choose an area that is easy to observe, following dermatology guidance or clinician advice. Several simultaneous changes make a reaction harder to trace.
Use the intended method
Apply a normal small amount and follow the product’s contact time. Rinse a rinse-off formula as directed instead of leaving it on for hours. Do not tightly cover the test or increase concentration to speed it up.
The American Academy of Dermatology recommends testing a new skincare product on a small area twice daily for seven to ten days, using rinse-off products as directed. Observe the area throughout the test rather than checking only immediately after application.
Stop when there is a reaction
Stop a product that causes redness, itching or swelling and gently wash it off. Significant or persistent symptoms need medical advice; urgent symptoms need urgent care. Do not continue applying to force the skin to adapt.
A tolerated test does not guarantee tolerance on every area or at every future time. Introduce the product cautiously and keep the ingredient list available if you need professional advice.
Common questions
Is this an allergy diagnosis?
No. Medical patch testing is a separate clinical process for investigating specific allergies.
Can I test several new formulas together?
Testing separately makes results easier to interpret. Introduce one new product at a time.
For related advice on gentle cleansing and moisturizing, read our gentle facial skin-barrier guide.