How effective is LED (Light Emitting Diode) for reducing facial swelling after liposuction & surgical masseter reduction?(photo)

I had facial lipo, surgical masseter reduction, buccal fat reduction on September 23. I had to come back to my city and the surgeon there I consulted before the surgery, who's not the one who operated me but is familiar with my case, suggested that I should do LED treatments to reduce swelling. My online research didn't produce much evidence in support of this, though I did two sessions already, not exactly feeling any striking difference. How effective is this LED for reduction of swelling?