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knot on leg

I was walking rapidly around the back of a polaris and the tail gate was down. The corner of it caught me middle of upper left leg. There is a very small bruise but it has a hard knot under it about the size of a marble. Could this be protein?
1 Responses
2046228 tn?1330105292
you could have bruised the muscle and at times if you have low blood it could be a form of a blood clot.. with me having low blood i can bump my leg, arm, etc and form a blood clot and it'll be bruised with a hard knot..
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