13 months ago
There are many causes for this such as:
1. excessive sweating
2. shaving with irritation, abrasion, hemosiderin deposition, etc
3. chemicals in antiperspirants such as the alcohols
We recommend treatment for the underarm hyperhidrosis (Botox) or the other techniques, and perhaps laser hair removal to avoid the continued trauma of shaving, plucking, etc. It is believed that shaving is the worst offender followed by sweating.
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