What it looks like: A rash, usually around the nose or mouth. It starts off as red sores that rupture within a few days and form yellowish crusts. Kids get impetigo when bacteria invade a cut in the skin or nasal lining.
What it looks like: Pimples or a bright-red rash, possibly with a white coating, in the genital area. When strep throat or impetigo is going around, kids can spread the bacteria below the belt. Anal strep causes painful bowel movements, and your child might complain of a sore bottom. Vaginal strep makes urinating painful.
What it looks like: A red, sandpapery rash on the torso (it usually shows up in the groin and underarms) that's caused by the toxins produced by strep bacteria. Scarlet fever may accompany strep throat.
Originally published in the March 2009 issue of Parents magazine.