Armpit stings, allergic reaction or not?

Not always: I am answering the question that i often get about armpit stinging with deodorant, this can be immunoglobulin e mediated allergy or cell mediated allergy (delayed type hypersensitivity, or type IV sensitivity) or merely irritation. A patch test can determine delayed type hypersensitivity, ige allergy is less commonly tested, irritation is diagnosed by the lack of other mechanisms.

Good Chance: Hard to say, but your axilla is a sensitive part of the body, and deodorants contain chemicals that can cause allergies!