Hit hand between index & middle knuckle. burst blood vessel? 50% of hand is bruised w/a knot between knuckles & very tender; should i b worried?

Yes if you have...: Most contusions/minor injuries will heal, but 50% of hand is bruised suggesting a bit more serious. If you have trouble moving the fingers, ?Deformity i.e. Crooked finger/hand bones, etc..Then you definitely need to see a doc. In the meantime, Motrin for pain and icing to reduce swelling before you get to see your doc. Good luck.

Not necessarily: Can you still bend and straighten your fingers? Any popping or catching? It many be only a bruise / contusion - if so should be improving within several days. If you have continued pain, loss of motion, or popping, seek evaluation by a hand surgeon.