The is not alarming. The most likely reasons are;
1) slight moisture; a sweat is the likely culprit.
2) yeast (fungal) infection.
So keeping the area dry is the key. You may apply over the counter yeast cream like Monistat, when this happen. If you are diabetic, controlling the blood sugar meticulously, would be very important.
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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