To receive antibiotics for a urinary tract infection, your urine culture had to have bacteria in it. So, the burning urination is related to that most likely. Do you have the urge to pee frequently, it burns when you are winding up the stream? Those are the usual signs of a uti. Are the antibiotics making that better? But once on antibiotics THEN a lot of the times you can get yeast to grow as the antibiotics kill off the good bacteria in the vagina. This can be really irritating to the whole area. Usually that does itch though and you don't say you itch. Your doctor can swab the discharge and fine out that too and also look at what you think are tears. The little bumps are probably nothing to worry about. That's just my opinion though so a doctor would tell you if that is the case or not.