K.
T., I don't know exactly what causes ringworm, but I do know that it is a fungus and is fairly contagious. Most of the time, kids get it from contact with other kids who have it. Boys can also get it from getting their hair cut with tools that have not been properly sanitized. As for as how you are treating it, if it is someplace other than in the scalp, you can treat it with antifungals (athlete's foot creams). However, if it is in the scalp, you need to take him to the doctor. He will need to go on an oral medication (for about 2 months). If this doesn't happen, it will leave a circular scar in his scalp where hair will never grow.