I have bruises that came out of nowhere on my legs and i need help finding out what they are or if i should see my doctor.

Worth seeing a doc: Although easy bruising is not necessarily a sign of a problem, it could be, so getting seen is a good idea. A simple blood test or two should give an answer and accomplish one of three things: 1) Give peace of mind, 2) Allow for early treatment if there is a problem that needs it, 3) Give info on whether or not it is important to take special measures to avoid injury.

Unexplained bruising: especially in a younger person like yourself probably needs to be looked at and possibly worked up by your Doctor. I would recommend an evaluation sooner as opposed to later.