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Sensitive skin
How to patch test new makeup, the way dermatologists do
A simple seven-to-ten-day test for any new lip or cheek product, what a reaction looks like, why fragrance-free matters, and when to stop and see a dermatologist.
The short version
- Test on the inside of your elbow or the underside of your forearm, twice a day for 7 to 10 days.
- Watch for redness, itching or swelling. Allergic reactions can take a day or two to show.
- "Fragrance-free" lowers the risk but doesn't remove it. Any ingredient can bother someone.
- If something stings or burns on your lips, wash it off and stop using it.
Why bother testing?
Most people use makeup without any problem. But skin reactions to cosmetics do happen, and lips are delicate: the skin is thin and has no oil glands. DermNet, a dermatology reference run by dermatologists, explains that there are two main kinds of reaction:
- Irritant reactions, where a product simply irritates the skin. DermNet says these make up about 80% of contact dermatitis.
- Allergic reactions, where your immune system reacts to a specific ingredient. These usually appear more than 12 hours after contact and peak around 48 hours, which is why a quick five-minute test can miss them.
A patch test won't catch everything, but it's the best simple way to spot a problem before you put a product all over your face.
How to do it
This is the method the American Academy of Dermatology (AAD) recommends:
- Pick a spot where the product won't be rubbed or washed off: the bend of your elbow or the underside of your forearm.
- Apply a small amount, about as thick as you'd normally wear it.
- Repeat twice a day for 7 to 10 days, leaving it on as long as you normally would.
- Check the spot each day for redness, itching or swelling.
The AAD's page doesn't give a separate method for lip products, so the forearm test is the place to start. If it's clear after a week, try the product on a small part of your lips or one cheek for a day before using it everywhere.
Testing a lip & cheek tint? A tint can colour the test spot, which makes redness harder to see. Look for itching, swelling, bumps or a rash rather than colour, and wipe the area gently with micellar water before checking.
If you react
The AAD's advice:
- Wash the product off gently and stop using it.
- A cool compress or a little petroleum jelly can soothe the area.
- See a dermatologist if the reaction is severe or doesn't settle. A dermatologist can do formal patch testing to find exactly which ingredient you react to, which is useful if it keeps happening with different products.
Get urgent medical help for swelling of the lips, face or throat, or any difficulty breathing.
Why fragrance-free matters
DermNet names fragrance as the most common cause of allergic reactions to cosmetics, with preservatives second. It also notes that fragrances and flavourings in lipsticks and lip balms can cause inflamed, dry lips. The AAD's advice for dry lips is the same: choose fragrance-free products and avoid flavourings such as mint and cinnamon.
Two details worth knowing, both from DermNet:
- "Unscented" isn't always the same as fragrance-free: some unscented products contain a masking fragrance to hide the smell of other ingredients.
- "Natural" or herbal products can contain plant extracts and fragrances that are just as likely to cause a reaction.
Fragrance-free lowers your risk, but it's not a guarantee. DermNet lists other lip-product allergens too, including some oils and waxes, lanolin, certain dyes and preservatives. That's why reading the ingredient list and patch testing are worth doing, whatever the label says.
Who should always test first?
- Anyone who has reacted to makeup, skincare or fragrance before.
- People with eczema or very sensitive skin.
- Anyone with currently chapped, cracked or sunburned lips: give them time to heal first, since any product can sting on broken skin.
Quick checklist
| Step | What to do |
|---|---|
| Where | Inner elbow or underside of forearm |
| How often | Twice a day |
| How long | 7 to 10 days |
| Watch for | Redness, itching, swelling, bumps or rash |
| If it reacts | Wash off, stop using, soothe; see a dermatologist if it's bad or doesn't settle |
One bottle for lips and cheeks
oli is an olive-infused, fragrance-free lip & cheek tint in Red, Dark Pink and Light Pink. Build it from a sheer flush to a bold colour in one to three layers. Rs 790, cash on delivery across Pakistan.
Sources
- American Academy of Dermatology: How to test skin care products
- DermNet: Contact reactions to cosmetics
- DermNet: Fragrance allergy
- DermNet: Contact reactions to lipsticks and other lip care products
- American Academy of Dermatology: Tips for healing dry, chapped lips
This article is general information, not medical advice. If your lips or skin stay sore, cracked or irritated for more than two to three weeks, or you have swelling or a rash, see a doctor or dermatologist.