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Patch testing: how to try something new, slowly

A new product does not have to go straight onto your whole face. A small, slow trial is a common-sense habit.

4 min read · Updated October 30, 2026

1What a patch test is

A patch test is a small, controlled trial of a product. You put a little on a small area of skin, often the inner forearm, and wait to see how that spot looks and feels before using the product more widely. Some product directions describe how to do it. If yours do, follow them.

2A simple way to do it

  1. Wash and dry a small patch of skin, such as the inner forearm.
  2. Apply a small amount of the product as the directions describe.
  3. Leave it as long as the directions say, and note the date and time.
  4. Look at the spot the next day. Note any redness, itching, swelling or discomfort.
  5. If you are happy, introduce the product slowly, one area at a time.

3Why “sensitive” is a loose word

Brands use “sensitive skin” for many different things, and people use it to describe many different experiences. There is no single definition on the label. If a product is marked for sensitive skin, read the ingredient list and directions the same way you would for any other.

4When to stop and ask

If a product stings, burns, swells or looks wrong, stop using it, rinse it off as the directions describe, and ask a pharmacist or clinician. They can look at your situation. We cannot, and nothing on this site is a substitute for that conversation.

General information only. Serumelo is not a medical provider, clinic, pharmacy, or retailer, and this is not medical, professional, or financial advice. Products and labels change. Check the packaging in your hands and ask a qualified professional about your own skin.

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