"Fragrance-free" and "unscented" sound like the same promise, and it is easy to read either one as a guarantee that nothing scented went into the bottle. That isn't a safe assumption. A dermatologist writing in the American Journal of Contact Dermatitis (Scheinman, 2001) pointed out that fragrances are used both to add a smell and to mask unpleasant odours, and that many items labelled unscented and fragrance-free contain fragrance chemicals most consumers would not recognise. The same paper notes that fragrance is the most common cosmetic allergen found when dermatitis patients are patch tested in the United States and in many places worldwide. So if scent bothers your skin, the word on the front is where you start checking, not where you stop.
Is all-natural the best type of acne therapy?
Not automatically. Plant ingredients can help, but the evidence is thinner than the packaging suggests. Tea tree oil is one that has been tested on acne directly. A 2026 systematic review and meta-analysis (Ye et al.) pooled seven studies with 445 patients and found tea tree oil was associated with a modest reduction in acne severity compared with control groups. Adverse events were mostly local and mild. The authors noted that clinical evidence for tea tree oil had been limited and inconsistent before their review, and said larger, high-quality trials with standardised formulations and long-term follow-up are needed to define its role.
Natural ingredients may also be the thing your skin reacts to. A Danish team (Bruusgaard-Mouritsen et al., 2020) label-checked 10,067 cosmetic products and found 121 naturally derived ingredients that each appeared in at least 30 of them. They described these ingredients as a possibly overlooked cause of reactions in some patients with dermatitis, and proposed a screening test series of 22 of them.
For ordinary acne, the NHS starts with plainer options (NHS: Acne): treatments you put on your skin such as salicylic acid or benzoyl peroxide, with a pharmacist able to advise. It says to see a GP if you've tried treating acne yourself and it isn't getting better, or if the spots are deep, painful or causing scars. Prescription treatments, it adds, are stronger than shop products and can be very effective for more severe acne.
Read the back of the pack
The word on the front of the bottle tells you less than the ingredient list on the back. Neither "natural" nor "synthetic" tells you how your own skin will respond, and the studies above suggest plant ingredients can help some people and cause reactions in others.
Reading that list takes a bit of practice. A short list is easier to reason about than a long one, simply because there's less to track. None of this requires memorising chemical names. It's closer to reading a nutrition panel: you're comparing, not diagnosing.
If a product has already irritated you, the NHS page on contact dermatitis (NHS: Contact dermatitis) says allergic reactions can be triggered by substances in products such as cosmetics, and usually appear within a few hours or days of contact. Its advice is to check the ingredients on make-up or soap for irritants or allergens, and it notes you may need to contact the manufacturer or check online to get that information. this contact form is one way to ask a supplier directly what's actually in a product before you buy a full size.
Try a small amount first
Dermatologists have a formal version of "try it on your arm first", called the repeated open application test. In an early study of it (Hannuksela and Salo, 1986), 86 patients with contact dermatitis applied test substances twice daily for 7 days to the inner forearm near the elbow, unless dermatitis appeared earlier. You can borrow the idea at home: use a new product on the same small patch of forearm twice a day for a week, and stop if it goes red or itchy before it ever reaches your face. It won't replace testing by a dermatologist, but it's a cheap habit that can stop a bad reaction from turning into a bad week.
Preservatives aren't the enemy
A product with no preservative still has to be protected from microbes somehow. A 2020 paper from France's Cosmetic Valley cluster (Catovic et al.) notes that as consumers ask for low-preservative and preservative-free cosmetics, protection against microbial contamination falls to the packaging instead. The group tested over 800 packages to grade how well they protect. So "preservative-free" isn't the same as "safer". The better question is whether the preservative a product does use suits your skin, which again comes back to trying a small amount before trusting a label claim.
None of this is about finding a miracle ingredient. It's about slowing down enough to read what's already printed on the box, and asking the maker when the box doesn't say enough.
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This article is general information, not medical advice. Speak to a pharmacist or doctor about your own skin.
References
- Scheinman PL. Exposing covert fragrance chemicals. Am J Contact Dermat. 2001;12(4):225-8. doi:10.1053/ajcd.2001.28697. PubMed 11753900
- Ye Y, Lim JJ, Huang Z, Chew FT. Efficacy and safety of Melaleuca alternifolia (tea tree) oil for acne: a systematic review and meta-analysis. Phytother Res. 2026;40(7):4444-4453. doi:10.1002/ptr.70344. PubMed 42098589
- Bruusgaard-Mouritsen MA, Johansen JD, Zachariae C, Kirkeby CS, Garvey LH. Natural ingredients in cosmetic products: a suggestion for a screening series for skin allergy. Contact Dermatitis. 2020;83(4):251-270. doi:10.1111/cod.13550. PubMed 32248558
- Hannuksela M, Salo H. The repeated open application test (ROAT). Contact Dermatitis. 1986;14(4):221-7. doi:10.1111/j.1600-0536.1986.tb01229.x. PubMed 2941220
- Catovic C, Martin S, Desaint S, et al. Development of a standardized method to evaluate the protective efficiency of cosmetic packaging against microbial contamination. AMB Express. 2020;10(1):81. doi:10.1186/s13568-020-01016-4. PubMed 32333203
- NHS. Acne. Page last reviewed 22 September 2026. https://www.nhs.uk/conditions/acne/
- NHS. Contact dermatitis. Page last reviewed 3 May 2023. https://www.nhs.uk/conditions/contact-dermatitis/