Here are few remedies:
Apply a paste of mustard seeds over the affected areas. Wash the scalp thoroughly with hot water before application of paste.
Rub a few slice of unripe papaya twice daily on the ringworm patches.
Rub castor oil on affected parts. It is valuable in case of ringworm on scalp.
Drink plenty of water and bathe twice daily. Rub the area vigorously with palm before taking bath.
Get fresh air as much as possible. Take sunbath early in the morning.