You are giving your child a bath and notice several bumps that weren't there earlier that day. They are scattered throughout the legs, but nothing is present on the upper body. She seems to have been scratching them. What could they be? The most common cause of such spots is insect bites. Here is the Dr. Sears guide to taking care or insect bites. Almost everyone has experienced insect bites, so it is no mystery what they look like. The main issue with insect bites is to treat the itching and to prevent infection.