Lump after Stapled Hemorrhoidopexy.

I am almost 3 weeks post op. I had a painless (no bleeding too) prolapsed hemorrhoid for the last 5 years which had grown to a big size, and hence I decided to get operated (also suggested by the GI surgeon). A laser stapled hemorrhoidopexy was performed. But I can still feel a lump at that exact place (at the mouth of the rectum) though it is of smaller size compared to my large pre-existing hemorrhoid. Had a follow up yesterday with the surgeon. He says that it's swelling which should heal in a month's time. He has asked me to follow more hygienic practices to keep the area clean to allow healing. But the lump looks very similar to my old hemorrhoid and the pain over that region feels similar to a boil. The surgeon who performed this is a renowned proctologist in Kolkata. Can anyone shed some light on this? Will this lump shrivel and get merged with the rectal wall over time? Thanks in advance.