One year ago I had a subcision done on a small area of my cheek. One of the areas that were treated developed a hard, convex nodule of scar tissue underneath the skin. I have received multiple modalities to try and flatten the scar, including hydrocortisone/Kenalog injections, pulse-dye laser, c02 laser treatments, therapeutic ultrasound, massage, and silicone sheeting. All have been yielded only minor improvement. Besides excision, what can I do?