Hi, Thanks for posting in HCM. I have read your description and understand your concern. Tear of internal sphhincter is a remote possibility as it lies quite deep inside the anal canal. Fissures are generally superficial and can cause some degree of damage to external sphincter leading to anal incontinence. Since you are not experiencing any such symptoms and also the fissure existed has healed, you need not worry much about it. In case you have doubt, you can get yourself clinically examined by consulting Surgeon. Hope the information provided would be helpful. All the best.