i don't know about the wipes - i would use something that doesn't have witch hazel. maybe an aloe medicated baby wipe. better yet, shower or take a hot bath after BM to clean the area and promote circulation.
i've used neosporin on the anus off and on to promote healing. since i'm not healed i can't say if it works or not, but it's comforting to think i'm doing something to help. and it feels kind of soothing down there for burning, stinging.
i have always been able to see my fissure. i use a hand mirror and kind of gently open the area and i can see the tail end of the fissure. it was much more visible a year ago, but i can still see a little crack-like opening. definitely don't fiddle with it too much. it doesn't help to see it, if you can feel it it's there.