I use diltiazem/lidocaine ointment on a gloved finger to gently dilate and stretch a stricture at my anastamosis (right at the inner sphincter) which tends to spasm and cause my fissures to recur. Because my fissures are chronic, the likelihood of botox (used to relax the muscles and prevent spasms) or surgery to excise the fissure, to be successful are diminished, and I am reticent to risk the chances of worsened incontinence.
There is a fissure support group online @ anal-fissure.org