minni
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Abrasions are generally the same as what most people would call "grazes". They involve the scraping off of the surface epithelium, or layer of cells, to various depths. A football player sliding into goal would get abrasions on elbows and knees, for example.
Another example would be abrasions on the knuckles from hitting somebody hard enough, if you weren't a regular puncher with callouses on the knuckles.
If your kid falls over while playing in the yard, he'd be likely to have abrasions on his body, hands, maybe face, etc. The "skinned knee" is an abrasion.
Hope that makes sense...
EDIT: here you go:
http://en.wikipedia.org/wiki/Abrasion_(medical)
the type you may get sliding down an embankment?