At 1 year after a breast lift and augmentation, a sharp indentation in the cleavage area is usually worth an in-person evaluation because it may reflect the implant edge or fold, thin soft-tissue coverage, scar tethering from the lift, capsular tightness, or the way the pocket was created along the inner breast. In the photos, there appears to be a visible angular contour change along the inner/right cleavage side, but photos cannot show whether this is skin, scar, implant position, or capsule-related. The next step is an exam by your operating surgeon or another board-certified plastic surgeon who can check the implant pocket, capsule, animation with muscle movement, and tissue thickness. If it is stable and not painful, it is usually not an emergency, but if it is new, worsening, painful, or associated with swelling, redness, drainage, or breast firmness, you should be seen promptly. Treatment depends on the cause and may range from observation or fat grafting for thin coverage to pocket/capsule revision or implant adjustment if the implant position or capsule is the main issue.