Unless you mean fat transfer (aka BBL), i would not recommend going to anyone for injections of any foreign substance for buttock augmentation. Please read on:I have unfortunately had many patients come to me after having their high hopes for buttock augmentation crushed by measly Sculptra...
It is very difficult to determine the exact size and shape implant you will require to best match your ideal butt image without an examination by a board certified plastic surgeon. Not just any board certified plastic surgeon, but one with many years of frequently performing breast augmentation...
The buttock Shape is flat because of loss of volume not because of excess skin. Excising skin will only make the butt appear flatter and you will have the added scar. The solution here is fat transplantation. Best of luck.