It may not be fissures, it could by irritated skin that's so raw it's cracked and bleeding.
That was my problem. My surgeon's words were "that's pretty torn up", which matches your description, I think.
My solution was thus:
1. Use moist sanitary towlets to clean, not dry paper
2. Dab, don't wipe
3. I used a product called ProShield that didn't sting at all and gave me almost immediate relief
4. I use a quarter sized piece of fluffed/rolled surgical cotton after every BM, put it right up against the anal opening. It helps soak up stomach acid that your pouch doesn't absorb, which was the major cause of my dry/raw skin.