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By Mayo Clinic staffPhysical complications of rectovaginal fistula may include incontinence, problems with hygiene, and irritation or inflammation of your vagina, perineum or the skin around your anus. In some cases, a fistula may become infected and form an abscess, a problem that can become life-threatening if not treated. Among women with Crohn's disease who develop a fistula, the chance of another fistula forming later is high.