Croup, strep, glue ear, and Kawasaki disease are among 24 illnesses parents must know. Symptoms and pictures from WebMD help parents know when to call the doctor.

When are boils dangerous? How many days do boils last? Can a boil go away on its own? Boils are pus filled skin infections that may lead to more serious secondary infections. They are also called furuncles. Learn what boils look like, how to tell a boil from a cyst or a pimple, and what kinds of infections cause boils.