Hemorrhoids are enlarged vascular tissue in your lower rectum and anus. That’s the opening at the end of your large intestine through which stool leaves your body. Everyone has hemorrhoids. They don’t cause problems unless they swell up, however. Swollen hemorrhoids can cause itching and pain around your anus that can make bowel movements uncomfortable. A thrombosed hernia is when a blood clot forms inside a hemorrhoid. This condition isn’t dangerous, but it can be painful.
The thrombosed hemorrhoid may heal with scarring, and leave a tag of skin protruding in the anus. Occasionally, the tag is large, which can make anal hygiene (cleaning) difficult or irritate the anus. Even after such a hemorrhoid goes away, a residual skin tag may remain, and this may need to be surgically removed.