Ringworm is actually caused by a fungus, not a worm, and can be treated at home. The National Institutes of Health recommend the following:
- Keep your skin clean and dry.
- Apply over-the-counter antifungal or drying powders, lotions, or creams. Those that contain miconazole, clotrimazole, or similar ingredients are often effective.
- Wash sheets and nightclothes every day while infected.
- Make sure to treat infected pets, too, or you can become reinfected.
If the infection does clear up within 4 weeks, or it worsens, seek medical attention. Reference:
NIH MedlinePlus Medical Encyclopedia: Ringworm <http://www.nlm.nih.gov/medlineplus/ency/article/001439.htm#Treatment>