Real questions about skin allergies, answered
Curated, editor-reviewed answers to the questions people actually ask AllerBot — patch-test next steps, reactive skin, hidden fragrance allergens. Ask your own version and get an answer personalised to your allergen profile.
Could my shampoo be causing the rash on my eyelids and neck?
Yes — and the location is the giveaway. Shampoo allergens rarely cause scalp rashes; they show up where the rinse water travels and where residue lingers: eyelids, ears, neck, upper back. Cocamidopropyl betaine and fragrance are the usual suspects, and both hide in 'gentle' and baby formulas too.
Read the answerI've had eczema my whole life — how do I pick products that won't trigger a flare?
Eczema skin absorbs allergens more easily through its leaky barrier, so product choice matters double: prioritize short ingredient lists, skip fragrance in all forms, be suspicious of botanicals, and know that eczema patients develop contact allergies to their own skincare more often than average — patch testing is worth asking about.
Read the answerWhat changes with the EU fragrance allergen labelling rules in 2026?
From July 31, 2026, cosmetics placed on the EU market must individually name ~80 fragrance allergens on the label — up from the historic 26 — instead of hiding them inside 'Parfum'. Newly declarable names include camphor, menthol, vanillin, and whole botanical oils like lavandin, ylang-ylang, and sandalwood. Existing stock can sell through until July 2028.
Read the answerIs 'fragrance-free' actually free of fragrance allergens?
Not necessarily. 'Fragrance-free' means no added perfume, but fragrance allergens like limonene or linalool can still enter a formula through essential oils and botanical extracts — and 'unscented' products may contain masking fragrance. The only reliable check is the ingredient list itself.
Read the answerEvery moisturizer burns my face — even the 'gentle' ones. What's going on?
Burning from products marketed as gentle usually means either a damaged skin barrier reacting to normally-harmless ingredients, or a genuine contact allergy to something that appears across many 'gentle' formulas — common culprits include preservatives, propylene glycol, and cetearyl alcohol. The fix is diagnosis, not more product roulette.
Read the answerI'm allergic to nickel — does that matter for makeup and skincare?
Yes, more than most people expect. Nickel isn't an intentional cosmetic ingredient, but it appears as a trace contaminant in pigmented products — especially eye makeup and mineral formulas — and in metal applicators and packaging. Eyelid dermatitis is the classic presentation.
Read the answerI just got my patch test results — what do I do now?
Turn the report into a usable allergen list, learn each allergen's label synonyms, audit what you already own, and check new products against your list before buying. The allergens on your sheet hide under many different names on real ingredient lists — that translation step is where most people get stuck.
Read the answerI switched to preservative-free products and my skin still reacts. Why?
Because preservatives may never have been your trigger — fragrance components, propylene glycol, lanolin, botanicals, and emulsifiers cause just as many reactions. And 'preservative-free' products often compensate with other actives or plant antimicrobials that are allergens themselves. Avoidance only works when it targets your specific allergen.
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