Filler or toxin for marionette lines? I lost weight after cancer treatment which has left pronounced marionette lines.

Possibly a bit of both? Glad to hear that you are the other side of cancer treatment. Toxin helps by softening the muscles that exaggerate the marionette lines, and filler can prop up the areas around the mouth and chin that have lost bone (which just happens, over time) as well as fat. Find a great practitioner and ask their advice, they will know what’s best for your particular face.