2year old biting hard his twin sibling.

My Baby-B is biting his twin Baby-A so hard everyday how much ever we see n take care it doesn't happen. It becoming more n more. We are very worried now about both. 1) I there any defficiancy to Baby-B that he is biting or being very violent with the other one ? Is there anything that we should worry about his behavior? 2) should we get any tetanus or get any ointment or tabs for the Baby A who is getting the deep cuts or getting bluish and pinkish bruises for almost a week to heal. Is it very dangerous and we should consult a pead? I know it's common at this age to hit and all but we are afraid that he might bite or scratch on eyes, nose or lips which is not that impossible as he is already aiming to scratch eyes or pull hair already. Please help us with your suggestions in how to deal with this situation also suggest some ointment for the wounds to heal faster.