Fat-dissolving injections are usually not the best way to treat a post-BBL “shelf.” They are unpredictable in this area and can create dents, firmness, asymmetry, or skin irregularity, especially if the fullness is not just superficial fat. The first step is to determine what is creating the shelf: transferred fat, remaining natural fat, scar tissue, skin laxity, or the transition between the lower back and buttock. If it is truly excess fat, careful liposuction can sometimes soften the upper buttock/lower back transition, but it must be conservative so the buttock shape is not flattened or made uneven. A revision consultation with a plastic surgeon experienced in BBL contouring would be the safest route. They can examine the tissue quality and decide whether liposuction, skin tightening, observation, or no treatment is the better choice.