Brown patch in arm pit

Hi, I started noticing a circular brown patch in my right arm pit and it is about 5cm in diameter from last 4 months it is not growing big and I have no loss of sensation or itching at that point. Curious what it could be.
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Dr. Srinivas C
Dermatologist 18 yrs exp Bangalore
It could be either Erythrasma or pityriasis versicolor . Trim your hair and use antifungal powder after bath daily. Wear loose fitting clothes and avoid deodorants. If it persists then Consult dermatologist for better management.
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