What They Are: Tiny mites that burrow into the skin and cause intense itching, which is usually worse at night. Mites tend to dig in on the hands, feet, and waist.
Yuck Factor: Medium to high. Because you can often see the burrows (they look like little curved scratches) and sometimes even the bugs poking out (a tiny black dot), your child's skin, not to mention yours, may actually crawl.
How They Spread: These guys make the rounds very easily -- either through contact with an infected person (hugging, holding hands), or through towels, clothes, sheets, and other personal belongings. As with pinworms, if one person has scabies, the whole family's almost surely doomed.
How You Know He's Got Them: Your kid starts itching like a maniac. Plus, there are those visible tunnels. Your doctor can probably diagnose by symptoms and examination alone. It can be hard to figure out where your child picked up scabies because symptoms might appear weeks after exposure. Great.
What To Do: You'll need a prescription lotion, so get right to the pediatrician if you suspect scabies. The bugs will persist unless the whole family is treated simultaneously. Wash all clothes, bedding, and towels that have been used in the last three days. Your doc can also recommend an antihistamine to help with the itching insanity.