Hello dear Understand your concern I think it is due to fungal infections (candidiasis) or dermatitis. Exact diagnosis is made by consulting dermatologist after examination and proper investigation. (swab test, cell culture, serology, NAAT test). Take following advice: wear loose pure cotton inner wear, change undergarment after work out, avoid sweating. apply liquid base moisturizer that contain petroleum jelly, vitamin and mineral, clotrimazole cream, if severe you can use hydro cortisone cream and oral flucanazol. Hope this may help you Best regards Dr. Sagar