I had a subaceous cyst removed from my back, right above my waist. It wasn't that bad, except I went right back into aikido 2 days afterward and tore my stitches. The scar is just damn ugly now, I really wish I had just stayed home.
Had another one removed from my jawline a year later, they did a great job, can't tell anything was there, no scar or anything.
I had one of these removed from my midback in January and it ended up being somewhat of an ordeal. I'd had it for years, then it became inflamed and painful. The doctor scheduled like 1 hour total to remove it, and despite having a med student there to assist it took like two hours to remove or something! The local wouldn't take since it was so swollen the injection wouldn't "soak up" so when he started I was in agony. He had to have the nurse get another bottle of the stuff and a fan since he was sweating like a pig.
It was initially billed as I'd be in only mild pain for a couple days and no restrictions. I was actually in quite a lot of pain for 2-3 days, but after that it cleared up except when I stretched (not exercise, just reaching) I seemed to rip something a week later.
Finally, I had switched to using a maxi pad on my back because so much fluid was draining from it. I went in to get the stitches removed and this moron replaces my maxi pad with a little band aid. Ruined my shirt and I had to go home from work early because blood came pouring out of it an hour later. A few weeks after this the incision failed entirely, leaving a gaping occasionally oozing hole in my back.
It took about 3 months in the end to re-heal from secondary intention (from the inside out). Its just an ugly sometimes pink scar now, itches sometimes and occasionally has tiny scabs in it (I think the tight scar tissue occasionally re-tears with stretching movements...I don't even notice, maybe some itching).
My advice here is to probably have some one who is good at these remove them. Also try to get air on it when it heals, but I couldn't really do that because I had to wear a shirt at work and a gory hole isn't exactly something you want to lie against the couch with.