I really hope my namechange has worked...
I went to the doc with a similar problem, she diagnosed 'piles' and referred me to a consultant.
He did the camera up the bum thing, said no piles, just a big skintag, which i could have removed under general anaesthetic. I asked about local and he said this was also possible, so i had it done under a local anaesthetic. It was burned off, the experience was fine, except when the surgeon tried to cauterise a bit that wasn't anaesthetised when i jumped and screamed. They injected a bit more anaesthetic then carried on.
The surgeon did express surprise at the size of the skintag ie apparently it was quite small, but it wasn't to me, and it's much better now it's no longer there!
I had such an aching bumhole all that evening. After that it was fine, except when i needed to use said bumhole. It was the most painful thing ever to do a poo, i frightened 3-year-old dd pooing in front of her and turning a funny colour with the pain.
Re healing, i put a couple of inches of water in the bath and washed it after every poo until it healed and suffered no infection, despite the wound's location...
It sounds like i was lucky to have been given the operation from what people on here have said.