I had that moist feeling for *months* after LIS. In my case there really was some kind of discharge. It wouldn't stain my underwear or anything, but when I'd give the area a good wipe, I'd definitely find it on the toilet paper. Some light liquid along with ummm "specks"
Gross, I know. Lately it seems to have finally stopped being noticeable, though (knock on wood).
And yeah it felt like nerves were having a frat party in my anus for a long time after surgery. All kinds of bizarre and random sensations ranging from stinging to aches. Definitely not nearly as bad as acute fissure pain, but certainly not pleasant either.