I had surgery a few years ago.
They did lipo and removed the glands. There is a difference because both procedures are different.
For removal of the gland they made an incision beneath the nipple and removed it. There is a very small scar but it is in the same location as the under part of the nipple so it is not noticeable.
For lipo they made incisions inder my arm pits. Each incision was about 1/2 cm (very small). Both healed and you cannot see a scar. I also had drain tubes for about a week and a chest wrap. The tubes were located under the breasts so there was also a small incision there too - and there is no scar.
Overall, recovery took about 6 weeks. I was very sore afterwards. I had no sensation in my nips for bout 4-5 months but after that I got total sensation back.
It is not a very serious operation but it does take a little out of you. IMO it is wonderful though and once the glands are removed they NEVER come back. My gyno was was puberty and I hated having puffy nips and it was awesome to get them removed.