Itching on the hand that starts as a small blister, forms ring-like patches, and spreads is most suggestive of a fungal infection (ringworm), especially since it improves temporarily with Betnovate-C (which contains a steroid) and then returns after stopping it. Steroid creams can reduce redness and itching for a short time, but often worsen fungal infections and cause them to spread or recur. The best approach is to stop using steroid-containing creams and start a proper antifungal cream such as clotrimazole, terbinafine, or luliconazole, applied regularly for a few weeks and continued even after the rash clears. Keep the area clean and dry, avoid scratching, and do not share towels or personal items. If the infection is spreading, recurring, or not improving, consult a doctor who may confirm the diagnosis and prescribe oral antifungal medicines if needed.