Armpit, or triceps?: Rashes in the armpit are often irritation from anti-perspirants;one can try switching or discontinuing temporarily to see if improves.Clothing,especially if tight,can also cause irritation.If the rash is in the triceps area, but not the armpit, it also could be a patch of eczema,although could also be irritation (contact dermatitis).Best to have it examined to be sure and get the proper treatment.
Answered 10/21/2020
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