A ringworm infection on the neck is a common fungal infection that causes itching and circular rashes, and it can usually be treated effectively with antifungal creams such as clotrimazole, terbinafine, or luliconazole applied twice daily for at least 2-4 weeks and continued for a few days even after the rash clears to prevent recurrence. Keep the area clean and dry, avoid scratching, and do not share towels or clothing to prevent the spread. It is important to avoid steroid-containing creams, as they can worsen the infection and delay healing. If the rash is spreading, not improving, or recurring, you should consult a doctor, who may prescribe oral antifungal medicines for complete treatment.