It may be because they're braiding their hair too tight, using hair straighteners or hot combs, or wearing pony tails. Hair straighteners contain strong chemicals that make your hair easier to style. If you follow the label directions carefully, hair straighteners usually don't cause problems. If you use them the wrong way, though, they can cause your hair to break. Worms don't cause ringworm, fungus does.
Children get ringworm more often than adults, and it makes their scalps red, scaly, and itchy.
It can also make their hair break off. It's easy to catch ringworm from other people. Your doctor will treat ringworm with pills, but it can still last for a several weeks. Don't worry if you have dark streaks or bands on your fingernails or toenails-they're normal. But if you notice that the skin crease around the base of your nail is getting darker, it could be a sign of skin cancer.