If it's for nothing, meaning you just get them out of the blue, it would be a good idea to get it checked out. It could be a real health problem, sometimes some kinds of cancer can cause bruising for no reason. If it's just a case that you hit yourself wihtout wanting too, or if it just that you bruise very easily, I heard this some time ago, it could be your blood pressure that is causing it. Sometimes taking certain medications can also cause such things?
if the bruising doesn't have a cause or it gets really dark and/or spreads, you should get it looked at. but if you'r bumping your knee on table legs all the time, or something like that, don't worry to much.
When you touch it does it hurt like a bruise?? If it does not go to the doctor asap it could be a sign of leukemia.
Maybe. I've heard bruising all the time can be signs of cancer. Get checked out by a doctor...
where is "same place" and where are u getting bruised usually