Redness not fading after 3 Vbeam treatments

I had abdominal surgery about 6 months ago. I had 3 v beam treatments since then, but my scar is still just as red as ever. Treatment was provided by my dermatologist but I wonder if I should see someone else because this does not appear to be effective. Am I being too impatient or do I have a legitimate concern about whether my vbeam treatment is being done correctly?