How to test a new product on your skin in 4 steps

Want to test a new product without risking your whole routine? There is a simple way to do it. It takes a few days, but it saves you irritation and guesswork. In this guide we explain the 4 steps, the reason behind each one and what to do if your skin reacts.

Why it pays to test first

Your skin is a barrier. When an ingredient does not suit it, it can react with redness, stinging, itching or flaking. Every skin is different. An ingredient that works well for one person can irritate another.

Testing does not guarantee you will never react. But it limits the area exposed and helps you find the cause if something goes wrong.

How to test a new product, step by step

1. Read the INCI and choose one product at a time

The INCI is the ingredient list on the packaging. The first ingredients are the ones present in the greatest amount. If you already know you react to an ingredient or to fragrance, look for it here before you buy.

Introduce only one new product at a time. If you add three new things and your skin reacts, you will not know which one caused it.

2. Patch test on a small area

Apply a small amount to the inner elbow, the forearm or behind the ear. Pick an area of thin skin that is easy to keep an eye on. Do not wash it off or cover it with other products.

Repeat for a day or two and watch. If you see redness, itching, stinging or spots, rinse with water and stop using the product.

3. Move to your face gradually

If there was no reaction, start on your face with a small amount. Use it every other day at first, to give your skin time to adjust.

If you have combination skin, each area may behave differently. Your T-zone may tolerate a product that leaves your cheeks feeling tight. Start where you plan to use it.

4. Watch and keep notes

Write down what you used, when, and how your skin looked. A note on your phone is enough. Some tightness or dryness at first can happen with certain actives, but strong stinging, swelling or new spots should not be ignored. Stop and let your skin recover.

Routine by ingredient type: what to expect

Not every ingredient calls for the same care.

  • Hydrating ingredients (humectants): such as glycerin or hyaluronic acid, help skin hold on to water. They are generally gentler, but testing is still a good idea.
  • Emollients and occlusives: soften skin and help reduce water loss. On skin prone to breakouts, introduce them slowly.
  • Chemical exfoliants (acids): loosen surface cells. They call for more caution, lower frequency and daytime sunscreen.
  • Actives for uneven tone: kojic acid, for example, appears in products designed for this purpose. It is an active, so it deserves the same care: a patch test first and sun protection.
  • Retinoids: these are demanding and can dry or irritate at first. Introduce one at a time.
  • Sunscreen: part of any daytime routine, especially if you use actives. Test it like any other product.

Common myths

  • "If it stings, it's working." Not a good sign. Strong stinging can mean irritation.
  • "Natural means it won't irritate." A naturally derived ingredient can still cause a reaction.
  • "I've used it before, so I don't need to test." Skin changes with the seasons, stress and other products. A new formula, even from the same brand, is a new product.

Frequently asked questions

How long should I wait when I test a new product?

Watch the test area for a day or two before moving to your face. If your skin is very sensitive, you can wait longer.

Which products suit combination skin?

It depends on what your skin needs in each area. Look for light, hydrating textures and introduce one product at a time. If you are unsure, take the skin diagnosis.

Can I test two products at once?

It is best not to. If there is a reaction, you will not know which one caused it.

What if my skin reacts?

Rinse with water, stop using the product and give your skin a break with a simple routine. If the reaction is strong or does not settle, seek help.

When to talk to a dermatologist

  • Redness, swelling or itching that does not go away.
  • Blisters, sores or heavy flaking.
  • Repeated reactions to several products.
  • Difficulty breathing or swelling of the face: seek urgent medical help.

You can read more about application on the how to use page and find more tips in #TipOfTheDay.

At Unnamed Cosmetics, every product comes with its full INCI explained: what it has, what it does and what it does not do. Find your skin type with the skin diagnosis.