Eli5: Why do we get a bump on our head when we bang it against something but nowhere else on the body?
In: Biology
Basically, lack of padding (muscle or fat) + proximity to bone = swelling.
Other places you could develop swelling would be shins, elbows, shoulder (where your arm bone connects to the long shoulder bone), and, as anyone who fights or rages on inanimate objects), your knuckles.
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