Are Blisters Next to the Vertical Incisions Normal? How Can It Heal W/o Scar?

I had a breast lift with implants 3 weeks ago. In my forth day I notice blisters next to vertical and the horizontal incision. Went to my ps and he said to put polysporin and cover with a gaze. I did but it got bigger and a bloody fluid start coming out...continue w treatment, but now it looks like a big scar. I am concern is this normal? Why it happens? What can I do not to get scar? My ps blame it to the bra and the surgical tape. I concern I willl be get scar.