It is difficult to diagnose the exact cause from photos alone, but bottoming out usually means the implant has dropped too low in the standing position, with the nipple appearing relatively high on the breast. Your photos show a contour change and asymmetry when lying down, which could relate to the implant pocket, capsule, soft-tissue support, or how the implant shifts with position rather than classic bottoming out alone. At 10 months, the result is mature enough that it is reasonable to be examined by your original surgeon or a revision breast surgeon. The exam should check implant position while standing and lying down, the breast fold location, capsule tightness, and whether the implant moves too far to the side or downward. If the problem is significant and bothersome, it can often be improved with pocket correction, capsulorrhaphy/internal sutures, implant exchange, or lift revision depending on the findings. If you have pain, sudden swelling, redness, or a rapid change, you should be assessed promptly.