Likely Irritation: Red skin (erythema) and bumps sounds like irritation. It could be from shaving, anti-perspirant, or chaffing. Hold off from applying anything irritating to the area for a week. If it doesn't improve, see a doctor. Fyi, other less common causes for something like this are inverse psoriasis, hailey-hailey disease, axillary granular parakeratosis and fox-fordyce disease.
Answered 2/4/2019
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