A thrombosed hemorrhoid typically appears as a dark blue or purple lump at the edge of the anus. Unlike a regular hemorrhoid, which may look like soft, swollen tissue, a thrombosed hemorrhoid contains a blood clot that gives it a distinct color and firmness. The lump is usually round or oval, feels hard to the touch, and can range from pea-sized to roughly the size of a grape.
Color, Shape, and Texture
The hallmark feature is color. A thrombosed hemorrhoid looks dark bluish-purple because trapped, deoxygenated blood has clotted inside the swollen vein. A regular hemorrhoid tends to be pinkish or flesh-colored, while the clot underneath the skin creates that unmistakable bruise-like hue. The darker the color, the more recent or dense the clot typically is.
The lump itself feels firm and solid, almost like a small marble under the skin. Regular hemorrhoids are softer and more compressible because they’re filled with flowing blood, not a stationary clot. You’ll also notice that the surrounding skin often looks stretched, shiny, and swollen. The area around the lump may appear red or inflamed due to the pressure the clot puts on nearby tissue.
External vs. Internal Thrombosed Hemorrhoids
Most thrombosed hemorrhoids are external, meaning they form just outside the anal opening where you can see and feel them directly. These present as painful, nonreducible lumps at the anal verge, meaning you can’t push them back inside.
Internal thrombosed hemorrhoids form inside the rectum and are usually invisible unless they’ve prolapsed, meaning they’ve bulged outward through the anus. A prolapsed thrombosed hemorrhoid looks similar to an external one (dark, firm, swollen) but may appear alongside softer, pinkish tissue that has pushed outward with it. If you see a dark lump protruding during a bowel movement that doesn’t retract on its own, that’s likely what’s happening.
How It Differs From Other Anal Lumps
Not every bump near the anus is a thrombosed hemorrhoid. Knowing the differences can save you unnecessary worry or help you recognize when something needs attention.
- Anal skin tags are small, soft, flesh-colored flaps of skin that feel like loose folds. They’re painless and don’t bleed. A thrombosed hemorrhoid is firm, dark-colored, and painful.
- Regular hemorrhoids are softer, pinkish or skin-colored, and may bleed with bowel movements but don’t have the hard, dark appearance of a clotted one.
- Perianal warts tend to be whitish, reddish, or grey-brown, grow only a few centimeters, and cause burning or itching rather than the intense, constant pressure-pain of a thrombosed hemorrhoid.
The combination of sudden onset, dark blue or purple color, firmness, and significant pain is what sets a thrombosed hemorrhoid apart from all of these.
How the Appearance Changes Over Time
A thrombosed hemorrhoid doesn’t stay the same. Its look evolves as the body deals with the clot, and tracking these changes can help you understand where you are in the healing process.
In the first few days, the lump is at its darkest and most swollen. The skin over it is taut and shiny, and the pain is usually at its worst. Within about a week, one of two things happens. The pressure from the clot may cause the overlying skin to split open on its own, releasing dark, old blood. This looks alarming (you’ll see bloody drainage on toilet paper or underwear) but it’s actually a sign of improvement. The lump shrinks, the color fades, and the pain drops noticeably after this drainage.
If the skin doesn’t split, the body gradually reabsorbs the clotted blood over the course of one to three weeks. During reabsorption, the lump softens, the color shifts from dark purple to brownish or yellowish (similar to a fading bruise), and the swelling slowly flattens. Pain typically improves within 7 to 10 days even without any procedure, and the lump may fully resolve within 2 to 3 weeks.
After healing, a small skin tag sometimes remains where the hemorrhoid was. This leftover flap is soft, painless, and skin-colored. It’s cosmetically noticeable but not medically concerning.
Signs That Need Prompt Attention
Most thrombosed hemorrhoids resolve on their own, but certain visual changes suggest a problem. If the lump turns black rather than fading through the normal bruise-color spectrum, that can indicate tissue death from prolonged loss of blood supply. Increasing redness, warmth, or streaking around the lump may point to infection. Heavy or continuous bleeding that soaks through pads, fever, or inability to urinate alongside the lump are all reasons to seek care quickly rather than waiting for natural resolution.
If you’re within the first 48 to 72 hours of symptoms and the pain is severe, a simple in-office procedure to remove the clot tends to provide the fastest relief. After that window, the clot has already started breaking down, and the body’s own healing process is usually the better path forward.