There's an easy way to know whether it's a fissure, does it hurt like all hell when you go? If not, it's definitely not a fissure. They are painful. Think of lemon in a deep paper-cut, or shards of glass slicing your bottom when you go, but it doesn't go away quickly, the pain sticks around for a while after BM. It's the type of pain that will have you pleading to a higher power for relief.
CRP, while they say it can be a good indicator, often isn't. I've been inflamed badly and had mine normal on many occasions. I am not saying this is the case for you, but i wouldn't use it as the "end all be all" of data in relation to flare up severity. The end all be all is a scope. FCP is better than CRP.
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