Body Mass Index (BMI). Body Mass Index (BMI) is measure of body fat based on height and weight that applies to both adult men and women. BMI does not differentiate between body fat and muscle mass. Therefore, body builders and people who have a lot of muscle bulk will have a high BMI but are not overweight or obese.
The bump: or hematoma as we call it, can last for 1-2 weeks. Sometimes it gets slightly worse before it gets better. If the child is acting normally, and not vomiting uncontrollably, she should be fine. If she starts doing those things, call your pediatrician.
Milia happen when a plug of dead skin cells becomes trapped just beneath the surface of the skin. Unlike a typical pimple (AKA a pustule) milia are neither red nor inflamed. Milia tend to hang around a lot longer than your average pimple, too. While a pustule will naturally heal within a few days time, milia can easily last for weeks or months. Here's some more skin trivia for you: one little white bump is called a milium.