Hard ridge on cheek 3.5 weeks after facelift/neck. Do these go away? Do I need more surgery? (Photo)

This is all very normal.  Try to find a local massage therapist who knows how to perform Lymphatic Drainage.  That can be very helpful in accelerating the healing process.

You appear to be healing pretty well at just 3.5 weeks. Numbness is completely normal for several weeks to months post-op.  Some patients will get these firm areas post-op which is often some excess swelling or inflammation in one area.  I usually recommend some warm compresses and massage over the area.  It should soften with time and blend in with the surrounding tissue.