From the photos, there appears to be asymmetric upper lip elevation during smiling or grimacing, with one side of the upper lip not lifting the same way as the other. A photo cannot identify the exact muscle or nerve involved, but after facelift surgery this kind of change can be related to temporary nerve irritation, swelling, scar tethering, muscle imbalance, or, less commonly, a more significant facial nerve branch injury. The most important detail is timing. If this is early after surgery, many cases of nerve irritation improve gradually over several months, often with the most noticeable recovery in the first 3 to 6 months and sometimes continuing up to 12 months or longer. Your surgeon should examine the full facial nerve function, compare rest and animation, and decide whether observation, facial neuromuscular retraining/physical therapy, massage, or treatment of scar tightness is appropriate. For symmetry while recovery is occurring, carefully placed Botox to the stronger side can sometimes soften the imbalance, but it must be done conservatively by someone experienced with facial animation. If the asymmetry persists beyond the expected healing period, evaluation by a facial plastic surgeon or plastic surgeon with facial nerve experience, and sometimes EMG testing, may help guide options. Sudden worsening, new weakness in other parts of the face, severe pain, or neurologic symptoms should be evaluated promptly.