For almost ANY health problem, I start with asking: Am I taking care of matters that are in my control: Proper nutrition, regular Physical activity, managing stress (with CBT) and having simple easily accessible fun -- plus -- most importantly -- having a general purpose in life that spurs you to be in your best shape so that you could best achieve Your purpose.

Looking at Mayo website, "Anal fissures are very common in young infants but can affect people of any age. Most anal fissures get better with simple treatments, such as increased fiber intake or soaking in a warm-water bath. Some people with anal fissures may need medicine or, occasionally, surgery."

In fact I'd did have years ago this condition which seems to have completely vanished...all I can say is that after retirement I'm able to take even better care of my lifestyle health issue -- starting with whole plant-based foods with lots of seeds, nuts, fruits. You can get detailed info from almost any reliable websites ( universities, CDC etc)

Good luck (I'll opt for pills as my Last Resort)