What can be done about multiple gluteal folds, and buttocks and thighs joined together? (Photo)

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 abdomen, hips, 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 :)
 

In a case like yours I would do a thorough examination to determine how much fat could be harvested from other areas of your body. Fit individuals can be a challenge but frequently small amount of fat can be taken from multiple areas. Depending upon how much fat is available the area of your concern can be improved slightly or perhaps corrected significantly. The fat will give your buttocks more shape and volume and help to define a separation between the lower buttock and back of the thigh. Additional fat could be used to taper into the depressions located on the sides of your thighs as well. The skin line you have may be reduced to some degree by the additional volume but will probably remain to some degree. You need to have a thorough evaluation with a surgeon who can determine if you have enough fat to transfer. Choose your surgeon wisely so that what fat you do have is put to good use.  Best of Luck   Dr Harrell