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You probably have a fungal infection
due to accumulation of sweat. You need to keep the area dry and clean, avoid sweat accumulation. Change the underwear eveyday. Apply Clotrimazole
ointment twice a day. You also need to take Antifungal medicine by mouth called Fluconazole
tablet 150mg once a week. Get shown to the Dermatologist
if it does not resolve.