Hmmm . . . which sphincter are we talking about? Sphincters are muscles that help close off parts of the body. For instance, we have a lower esophageal sphincter to prevent stomach acid from refluxing back up into the esophagus as this leads to heartburn. We have sphincters to help control urine flow so we don't leak. However, I suspect that you wouldn't be able to notice any tissue swelling around either of these. Perhaps you're referring to your anal sphincter. Painful tissue could be an external hemorrhoid while a nontender one could be an internal hemorrhoid. Of course, a tender one could also be an abscess while a nontender one could be a polyp or skin tag. Best to go see your family doc. Good luck!
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