Good day and thank you for the question. As my colleagues have stated, there is not much fat in the collarbone area. So, whatever procedure you and your doctor decide upon, you will want to tread lightly. I would advise against traditional liposuction as that could affect the balance of your breasts and surrounding areas. The micro-contouring capabilities of something like VASER liposuction may be effective at sculpting the area of concern. But I would personally investigate some minimally-invasive procedures first. We do CoolSculpting at my Los Angeles practice all the time. It is, indeed, an effective way to target stubborn pockets of fat in a minimally-invasive way. There are also a number of radiofrequency devices currently being used by MedSpas across the US. RF energy liquifies adipose fat tissue, causing some fat reduction and tightening the skin above. You may find the results you seek in RF treatment because the tighter skin could accentuate your collarbones.