Bursted vein in arm, is it okay?

It is ok.: Trauma to an area will many times cause a vein to be injured and burst resulting in bleedind from the vein into the surrounding tissues resulting in a black and blue mark. This is called ecchymosis. Over a week or so this will slowly resolve. This is a normal occurrence . If, however, you have recurrent spontaneous bleeding without trauma then you should see a hematologist.