How to Patch Test Skincare Safely

A patch test means applying a small amount of a new skincare product to a discreet area of skin and waiting to see how your skin responds before using it as directed. It is the simplest way to reduce the risk of an unexpected reaction — particularly with active, medical-grade formulas such as retinoids, exfoliating acids and vitamin C.

Even excellent products can disagree with individual skin. Reactions range from mild redness or tingling to contact dermatitis — an itchy, inflamed response the NHS describes as common with cosmetics and toiletries. A 48-hour patch test catches most of these responses on a small, hidden area instead of your whole face.

Active ingredients such as retinol also cause an expected adjustment period (mild dryness or flaking). A patch test helps you tell the difference between normal adjustment and a true reaction.

Everyone starting a new product — but especially if you:

• Have sensitive, reactive or allergy-prone skin
• Have a history of eczema, rosacea or contact dermatitis
• Are starting a retinoid, exfoliating acid (AHA/BHA) or high-strength vitamin C for the first time
• Are using several new products at once (test them one at a time)

If you are pregnant, breastfeeding, or under the care of a dermatologist, check with a healthcare professional before starting new active skincare.

Do not apply new active skincare to broken, sunburnt or infected skin, immediately after professional treatments (peels, laser, microneedling) unless advised by your practitioner, or alongside prescription treatments without professional guidance. If your patch test produced any reaction, do not use the product — contact us and we will help you find a suitable alternative.

If the test area looks and feels normal after 48 hours, begin using the product as directed. Introduce strong actives gradually — for example, retinoids every other night for the first two weeks — and always follow the usage guidance on the product page and packaging.