KJeane-
Do you have a bidet? I suffered with what the docs always diagnosed as chronic cuffitis for years-canasa did nothing, and they'd only prescribe the steroid suppositories on occasion or for short term use, so I just learned to live with it. Since I got my bidet (which has pretty high water pressure, and I use it to really squirt water up in there a couple times a day (biobidet i3000, $200 on ebay), I almost never have cuffitis issues anymore.
When I have had Fissures, they have been a little more external-probably TMI, but with a fissure, if I get down on the floor with a hand mirror, I can usually see the fissure (a small ulcerated spot on the skin-mine were always right in the folds of the "puckered" skin near the anus down there).
Best of luck-