Hi Quiggles - I had an LIS and skin tag removal, and for me, the first week was the worst for pain. After that there was some discomfort, but that gradually improved. I've read a few posts from boardies who had skin tag removals, and it seems that discomfort is pretty common, especially at the skin tag site, and it can take a while for the skin tag site to settle down. In my experience, sometimes the stinging sensation is caused by a wee bit of poo in the wound, so it's important to clean thoroughly (but gently!). Other times it's just that the tissue is traumatized and unhappy. Warm baths really help with both issues. I also took a muscle relaxant (extra-strength Robaxacet) to help with the residual soreness during the first week after my surgery.
Lots of folk on here mentioned that the skin tag area can take a while to heal, so the key is to try to be patient. It will get better. Keep your stools nice and soft, take those nice warm soaks and hang in there! You will heal and the discomfort will go away.