Creams, and antibiotics. These types of health treatments are ambiguous at best, you should consult a physician before doing anything to "official" icy-hot pads are great, and fluids do as much as-the stereotype.
Ringworm is a fungus. To treat it, use an over the counter fungal treatment such as Lamasil or Tanactin. If you're unsure, you can always ask your pharmacist.
There are several effective otc treatments for ringworm. The best is Ketoconazole which is a cream and shampoo that slows down the infection spread. The next is Miconazole which also slows the spread and has antibacterial properties also.
Ringworm is not parasitic. It is actually a fungal infection. There are a number of over the counter anti-fungal creams available. One can either speak to a pharmacist about what would be the best treatment or read anti-fungal cream labels for those that treat ringworm.
There are over the counter creams that can be used for the treatment of ringworm or other fungal infections. Look for tinactin, lamisal or other creams.