Too skinny for BBL. What are my other options? (Photo)

Thank you for your question,
You may be a candidate for Sculptra Butt Injections. They are a safe, non-surgical way of increasing butt volume. Please consult a board certified plastic surgeon.
Regards,

Thank you for your question. A BBL  procedure must be planned according to the individual needs of patients, harvesting fat from target areas of the torso, thighs or knees and transferring it to create smooth, attractive contours optimized for each person. The amount of fat transferred depends on the quantity available and the extent of buttock augmentation each patient desires.  Sufficient body fat for a buttock augmentation is very patient-specific, depending on an individual’s body shape and proportions as well as their expectations.  Buttock augmentation with fat grafting is one of our most popular procedures in Colombia, and from experience we can tell you that some patients do very well with 300 cc of fat per side while others can need 800 cc or more.  If you put on weight before surgery, there is more to transfer.  But I do not generally recommend this because we augment the buttock during surgery for optimal shape, and if you then lose the weight post operatively you will loose it disproportionately from your augmented buttock and the results could suffer.  We recommend patients to keep their normal weight and body form prior to surgery, and then we are working from a stable situation to create the changes we are working for.That said, you definitely have to choose your surgeon correctly and make sure that he/she has the training and experience to meet your goals with absolute safety.  Best is a Board Certified Plastic Surgeon with specialized expertise in this procedure.

I rarely if ever recommend weight gain prior to a BBL.  Gaining weight is often counterproductive. If you gain weight that is fat, some of the fat will likely be associated with the buttocks. I think it is better to maintain a stable weight you can sustain after the BBL.
I can usually find enough fat on any physique for the procedure, although I have seen a patient or two who are not candidates for the BBL.  The outcome of the BBL will depend upon whether your expectation is for a drastic change and the ability of your surgeon to remove fat. My philosophy is to place as much fat as possible without causing fat necrosis or undue pressure.  I always anticipate that only 50% will survive, but frequently more does. 
Kenneth Hughes, MD, Board Certified Plastic SurgeonLos Angeles CA

A combination of an implant and fat grafting provides projection and volume with the fat graft serving to blunt the edges of the implant.

Without fat reserves, you will not have enough fat for a BBL.  The only other option is implants. ....