Since your skin is clear and antifungal treatments haven't resolved the issue, the itching is likely caused by sweat-induced irritation and friction (intertrigo) rather than an active infection. To manage this, keep the area completely dry and apply a protective barrier cream containing zinc oxide or calamine to soothe the skin and prevent moisture buildup. For relief from the itching, you can apply a mild hydrocortisone cream (1%) twice daily for up to 5 to 7 days. Wear loose, breathable cotton underwear and avoid harsh soaps. If the discomfort persists, please consult a dermatologist for a personalized evaluation.