Anal stricture or anal stenosis is a narrowing of the anal canal.[1] It can be caused by a number of surgical procedures including: hemorrhoid removal and following anorectal wart treatment.[2]
^Katdare, MV; Ricciardi, R (February 2010). "Anal stenosis". The Surgical Clinics of North America. 90 (1): 137–45, Table of Contents. doi:10.1016/j.suc.2009.10.002. PMID20109638.