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Hi and thanks for the query.
Indeed, the inference drawn is right. I have seen a few cases where the anal verge and or the surrounding tissue was scarred resulting in constriction of part or all of the sphincter. This can be easily sorted out, but you will have to see a plastic and reconstructive surgeon for this.
Just simply excising the scar will cause the resulting fibrosis to again cause constriction and form a band. The best fix is to excise the scar and fill the defect with a local flap from the surrounding area, I have used limberg flaps in most instances and bring the surround skin as a flap in the defect left by the scar tissue, this introduction of good tissue fill the defect and breaks the scar and there is no constriction later on. With smaller scars like the one you have from the 11 to 2 O clock position, you will not even require post operative dilatations, which is the case with circumferential or near circumferential scars.
So, the best course of action will be to get assessed by a Plastic and Reonstructive surgeon.
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Wish you good health.