Ischiorectal fossa abscess after pelvic floor injection of botulinum toxin.

Botulinum toxin is used to treat pelvic floor tension myalgia; however, its safety profile is poorly understood. We report an ischiorectal fossa abscess after pelvic floor injections of botulinum toxin. Physicians need to be aware of this possible complication, consider alternate injection techniques and antiseptic preparation before injection.