Hello dear Understand your concern I think it is either dermatitis or yeast infection. Other causes: Balanitis: due to poor hygiene Friction injury produce reaction Contact dermatitis Psoriasis or thrush Advice are below: Wear loose pure cotton inner wear Change to a simple, unperfumed soap. Put two handfuls of salt in the bath, but no other additives Do not use biological powders when washing your underpants Showering after a plying , changing underwear, using a clean towel to dry off with and not redressing until the area is completely dry Apply liquid base lotion that contain vitamins and minerals Tablet metrogyl Apply anti fungal clotrimazole plus hydrocortisone cream if severe or not resolved. Hope this may help you. Best regards Dr. Sagar