For a suspected fungal skin infection, generic over-the-counter antifungal creams like Clotrimazole, Miconazole, or Terbinafine are highly effective. Apply a thin layer to the clean, dry affected area twice daily. However, because you are experiencing severe pain alongside itching, please consult a healthcare professional. Pain can sometimes indicate a secondary bacterial infection or a different condition that requires specific treatment. In the meantime, keep the area dry, wear loose cotton clothing, and avoid scratching to prevent further irritation. A quick physical exam will help confirm the diagnosis and get you the safest, most effective relief.