I came by this article on the subject of treatment of anal fissures. The article mentions procedures & methods of healing that I have never heard of. From humble dilation to carbon dioxide lazer treatment and everything inbetween. Reference is made to the potential side affects of all the techniques-if applicable,
The information seems to be from a reliable source. I'm posting this in the hope that if one small piece of the information is helpful to just one person, then it has been worth it.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2141661/