What surgery should I undergo to make buttocks symmetrical and remove infragluteal fold? (Photo)

Thank you for your question and all the pictures you sent.  Your question is a common one in my practice either as a primary concern or as a result or overzealous #liposuction to the 'banana rolls' (upper back or thighs where the thigh meets the buttock). 

Am I correct to assume you are the young lady with the pink
sweater?  If so, I would first
point out that the shape of your buttocks now seem more square and your #PlasticSurgeon should aim at restoring an A-type buttock, as in your other 3 pictures (see my blog on Buttock Shapes). 

I would consider a small amount of liposuction in the lower
waist region to help with the hour-glass curves (providing what I see on the pictures to the right is a slight
excess of fat and not the body iliac crest). 

I believe a #ButtockImplant would help tremendously in restoring
your buttock fullness and shape. 
We do have several shapes and sizes.  I would recommend a round implant for you as to steer away
from the square look.  An implant
would also lift your buttocks and make your infragluteal folds less prominent. 

Finally, fat grafting to –and across – the folds would also
help to blend your buttock into the back of your thighs, hence blunting the
folds - a technique we often do along with the #BrazilianButtLift.  You do not have a lot of
fat to give yet, a small amount of fat grafting might help. 

Hope this helps!

Check my blog for more information.Dr Marc DuPere, Toronto board-certified plastic surgeon

   I think that the Brazilian buttlift or the buttock implants may be reasonable.Kenneth Hughes, MDLos Angeles, CA

Hello dear!
Thanks for the question and provided information as well.
Based on your pictures, you are a good candidate for liposuction with BBL, and I think you'll get very good results. 
Liposuction allows your plastic surgeon to transform your entire shape. You can improve your back and flanks, and of course your buttock, to give you a beautiful heart shape.
In general, you need to be physically healthy and at a stable weight, have realistic expectations, be a non-smoker and your BMI needs to be 30 or less.
l recommend you to make an appointment with a board certified plastic surgeon to talk about your goals and anything you need to know.
Good luck :)