You are correct. Ringworm is very infectious and is caused by a fungus infection. Scalp ringworm is difficult to treat and can become very unsightly and chronic. The only effective tretament is to give your son a medicine called Griseofulvin liquid in a dose of 250mg once daily for 6 weeks. It is essential to complete the course and not to miss a single dose of the Griseofulvin in order for the treatment to be successful.
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