Every deodorant I try makes my armpits i

The short versionStop guessing brands — that's what's been keeping you stuck. A deodorant reaction on the armpit is a contact problem (skin meeting a substance), not the kind of allergy where "fragrance-free" buys you safety. Something in every formula is landing on your skin and your skin is telling you so.

I can't diagnose this and I'm not going to guess your trigger from here. What the clinical reference material does say is useful, and it's the honest core of your answer:

> "Allergic contact dermatitis appears as an itchy, weeping, rash, on the area of the skin that has come into contact with an allergic trigger (allergen)." — ascia-food-allergy, https://allergy.org.au/patients/skin-allergy/contact-dermatitis

> "It usually develops two or more days after contact with the allergen. If contact with the allergen continues, the rash may continue for several days or longer." — same source

> "If the cause of allergic contact dermatitis is unclear, patch testing can be helpful." — same source

That last line is the direct answer to "how do I find out." Brand-hopping will not find it. Patch testing with a clinician will.

One more, and this one matters tonight because of what's in your kitchen:

> "If the same cream or ointment is applied again, a rash can develop about two days after it is applied." — ascia-food-allergy, same page

Your plain moisturizer is *also* a candidate suspect. A product that feels soothing can still be a contact allergen.

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1) What you've tried vs. what actually moves it forward

The one thing that hasn't been tried: a clean baseline. Switching brands weekly means your skin never gets a quiet stretch to tell you anything. Each new deodorant re-triggers before the old one has cleared, and you have nothing to compare.

Tonight — a ~10-minute reset:

1. Rinse the underarms with lukewarm water only. No soap, no scrub, no washcloth. Pat dry with a clean towel.
2. Apply a *small* amount of the plain moisturizer — a pea-sized amount, thin layer, only on intact skin. This is barrier comfort, not a treatment. If it stings, wipe it off; that is information.
3. No deodorant, no body spray, no scented powder, nothing in that area tonight.
4. Set a photo of both armpits in the same light, plus one of the ingredient list of the last product that flared.

For the next 14 days, the honest trial: deodorant-free. Not "try the sensitive line." Free. Then when your skin is quiet, you get to reintroduce one product at a time, and the "one at a time" is the whole trick. Two new things in the same week tells you nothing.

When you go to a clinician, the ask is specific: a patch test, and bring the actual product or a clear photo of the full ingredient list with them. "Patch testing can be helpful when the cause is unclear" — this is the exact situation that sentence describes.

Screenshot this for the appointment:

```
WHAT I'VE TRIED: deodorants — [brand A], [brand B], [brand C], incl. fragrance-free
SAME REACTION EVERY TIME
OCCURS IN: armpits only, both sides
TIMING: itch starts [___] hours / [___] days after applying
ALSO TRIED/STOPPED: [plain moisturizer / soap / shaving / new laundry product]
WHAT I WANT: patch testing, and ideally testing against the specific
product I bring```

The timing line is the highest-value thing on that list. Fast irritation and delayed allergic contact look the same to you but point the clinician in different directions.

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2) Avoid list

Stop, no exceptions, this week:

• All deodorant and antiperspirant, including "sensitive," "natural," "aluminium-free," and fragrance-free lines
• Body spray, perfume, aftershave, scented powders in that area
• Home remedies — lemon juice, vinegar, baking soda, essential oils, diluted dish soap. These are not neutral. On already-reactive skin they are a well-known route to a second, worse reaction, and you won't know which product did it.
• Anything bought to "fix" it online or a prescription-strength product applied without a clinician's plan

Also worth pausing, one at a time, one week apart — because they touch that skin:

• Shaving right before application. Fresh micro-abrasions carry product deeper. If you shave, space it well away from any product trial.
• New laundry detergent, fabric softener, dryer sheets — clothes sit against exactly this skin all day.

Careful with the one product you trust: introduce the plain moisturizer on its own. Nothing else new in the same 3–4 days. If the itch flares two days after you start it, that's a real answer and it's worth telling the clinician.

Household note, since the school week is on: whoever else is in the house should not be reaching for your products, and towels don't get shared out of the bathroom while your skin is settling. Not because it's contagious — it isn't — but because you need every variable quiet to read the result.

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3) Red flags — when to stop DIY

Stop everything and get to a clinician within a day or two:

• The redness is spreading beyond the underarm, or the skin feels hot and swollen
• Blisters, open sores, oozing, or yellow crusting
• Pain that's more noticeable than the itch
• The area isn't clearly improving after 10–14 days with nothing applied
• It starts appearing on your hands, face, or neck — that's a different pattern and needs looking at properly

Stop and seek urgent care now:

• Swelling of the lips, tongue, face, or around the eyes
• Any difficulty breathing, wheeze, or your voice changing
• Feeling faint, dizzy, or rapidly unwell

For those last ones: use your prescribed auto-injector if you have one, and call your local emergency number. Don't wait to see if it settles.

One specific one worth knowing: on darker skin, a reaction can look more dark-purple or grey than red, and blisters can appear where redness usually would. If you're not sure whether a mark is new or just your normal skin tone, photograph it in the same light each day. Comparing beats guessing.

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What "success" looks like in 24 hours

Not a cure — I can't promise you that and I won't.

By tomorrow night: the itch is quieter than tonight, the skin isn't actively peeling in new places, and you've got one photo of the last offending product's ingredient list plus a note of how many hours it took to start. That's it. Three concrete things.

Those three things are what make the patch test worth doing, and what turns "deodorants break me" into a question a clinician can actually answer.

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One thing I'd ask, because it changes what you tell the clinician: when the itch starts — within minutes to a couple of hours of putting it on, or a day or two later? And separately: does it happen with *every* deodorant including the fragrance-free one, or is it patchier than that?