Ringworm On Thumb. Tinea manus is a common companion of tinea pedis ( ringworm of the feet ). It is known as tinea corporis.

It is caused by a fungus. Wash and dry the area before applying the cream and use twice daily for at least two weeks, recommends the mayo clinic 1. Then the skin heals and becomes a solid, smooth,red oval (almost to the point where fingerprint patterns are gone).