Children's Health Problems Head lice are bugs about the size of a sesame seed. They live on blood from people. Louse bites cause very bad itching and red spots that look like mosquito bites. You hardly ever see adult lice. Nits are lice eggs on the hair.
Nits look like dandruff.
Lice spread fast. No matter how clean your child is, he or she can get lice. Your child can get lice at school or from anyone who has lice. Lice lay about 6 eggs a day. The eggs hatch in 8-10 days.