Ringworm near the outer vaginal area is a fungal infection called Tinea Cruris, and temporary relief with creams like Betnovate-GM happens because they contain steroids, which can worsen the infection over time. It is important to stop using steroid-mixed creams and continue a plain antifungal treatment regularly for at least 2-3 weeks, even after symptoms improve. Keep the area clean and completely dry, wear loose cotton underwear, and avoid tight clothing or moisture. Night-time itching is common due to warmth and sweating. Since your symptoms are persistent, it is best to consult a doctor for proper evaluation and guidance to ensure a complete and lasting cure.