Put a ring on it? What kind of ring? Is this a relationship question? More specifics please.
How to get a ring off, when your fingers are swollen? Is it standerd to remove a ring when putting a splint on?
Cold. Usually cold water does the job. If not check with your doc.
Contact. From contact with an animal, person or item (like pillowcase etc) that is infected. It is contagious.
Antofungal. If the topicals do not work, than a course of a systemic or oral antifungal could be used such as griseofulvin. Lanisil, sporonox, Nizoral (ketoconazole) or diflucan.
Tinea corporis. Tinea corporis (ringworm) is a fungal infection of the skin generally characterized (intially) by a red raised round patch, followed by central clearing and an advancing border. Treatment is with topical antifungals, and covering with a bandage can help prevent spread to self and others.