Persistent Pain a Year and Half After Face Lift

Pain 18 months after the procedure is certainly not normal.  It is not unusual to have this in the first few months after surgery but it typically goes away within the first 6-12 months.  I agree with trying massage as an initial step.  Although it seems counter intuitive, it may help decrease your sensitivity.  Evaluation by a neurologist might be helpful if the massage does not adequately relieve your symptoms.

Sorry to hear that you're experiencing discomfort with your face lift procedure. This is an unusual event. Out of nearly two thousand face lift procedure I have performed, I had one patient in the past that experienced similar prolonged discomfort. After treatment with Neurontin, Kenalog injection to the triggered point, as well as massaging her discomfort resolved. Wish you well.

Depending on the nature and location of the pain, it may be worth re-elevating the skin (flap).  This has been reported to allow the nervers to re-innervate the skin.

While this isnt definitive, it is a simple enough thing to try to relieve your symptoms as this isnt typical.