My son had exactly the same on his bum for years but recently had it removed because it was getting in the way. The hospital were great, they just got on with the job.
Another story, my friend is a nurse who had very bad piles and had to have them removed. She was asked if she wanted to go to another hospital because it would be her work mates that would be carrying out the procedure, she laughed and said no lets get on with it. It was all done in a very professional manner as you would expect.
Then there was the time I was in the waiting room in dermatology having the biggest laugh ever, this wonderful woman couldn't sit down and she told a room full of people why, it was because of a big fat boil on her bum, she didn't care because that's life!
The hospital staff have seen it all, relax and get this tag removed with no worries