It seems you sweat a lot in the groin region. If you also have itching it could be a fungal infection, Tinea Cruris. Persistence wetness in the region is the cause. The cream you are applying is anti fungal & antibacterial. But it should be seen by a doctor and seen if there is a necessity of giving oral medication too.
Next Steps
Confirm the diagnosis
Health Tips
Keep the area dry. When you go to play, change the under wear there only if washroom facility available. Wear loose underwear. After taking bath completely dry the area. Do not rub hard. You can use a dryer instead. keep change of underwear with you in case it becomes wet in office due to sweat. Take care specially in rainy season. Fungal infection are stubborn & recur, hence take longer treatment. So keep applying prescribed cream for some time even after it i apparently treated. All the Best .