Treatment for fungal infection in the groin and skin folds usually includes applying antifungal creams such as Clotrimazole to the affected area as advised by a doctor. Keep the area clean and dry, wear loose cotton clothing, and avoid excessive sweating. Do not scratch the area, as it can worsen the infection. If the rash does not improve within 1-2 weeks or spreads further, it is best to consult a doctor for stronger medicines or oral antifungal treatment.