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Keratin, which can be found on the outer layer of the skin, hair and nails feed the fungi that causes ringworm in humans. They grow rapidly in warm and damp areas. Luckily, several medications are now available to cure ringworm in humans. Doctors recommend antifungal creams or agents for ringworm on exposed skin. Tinactin cream, which will block the growth of fungi that cause skin infections, is generally prescribed to people with ringworm on feet and groin. Antifungal shampoo, on the other hand, is suggested for those with ringworm on the scalp. Treating ringworm on the scalp can be complicated since the fungus that causes the problem thrives in hot and moist environment such as the scalp. With this, oral antifungal medication can also be taken to effectively resolve the problem.
In conclusion, ringworm in humans is highly curable, and it can be prevented through improved personal hygiene.
For more information please read this article on Ringworm and on Treatments for Ringworm