Medically reviewed by Susan Bard, MD Some causes of underarm rash include infection, allergic reaction, and inflammation. Itchy, inflammatory, bacterial, or fungal rashes in your armpit can be mild or ...

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Baby yeast infection symptoms include bright red rash with pimple-like dots or a thick ... can occur in any warm and moist area on the body, like folds of skin, or in the diaper area.