This is likely a fungal skin infection that has spread. The creams you used contain strong steroids, which may worsen fungal infections and cause skin colour changes. You should stop using these steroid combination creams and apply a plain antifungal cream (such as clotrimazole or miconazole) for 2 to 4 weeks. Keep the area clean and dry, and avoid applying oil or heavy creams. If there is no improvement, consult your doctor or dermatologist, as you may need oral antifungal treatment.