Dealing with blister from thong bra (Photo)

It´s very common to have blister, there uncomfortable and sometimes worrisome ... They can form form simple rubbing the skin with a new tight bra, also they form from a reaction due to the glue in the tapes that cover the wound. When I have this problem a change the patients bra to a looser one like a sports bra... I dont cover the wound with any tapes just a simple gauze and I lubricate with neosporin and let them heal to form a crust that eventually falls out. 

As long as the blisters are truly from your bra, removing the pressure is your best bet. I also recommend an ointment, such as Aquaphor, until they're healed. 
Importantly, there are some other unusual causes of blisters, such as infection or skin healing problems, so you should reach out to your surgeon to make sure everything is OK.