Why Do I Feel a Lump Around My Anus?

Painful vs Painless Lumps

The single most useful question to ask yourself is: does the lump hurt? A painful lump usually points to something acute — a blood clot (thrombosed haemorrhoid) or an infection (abscess) — and often needs prompt treatment. A painless lump is more likely something that's been quietly building up — a skin tag, an external haemorrhoid, or in rarer cases, something that needs a closer look.

Thrombosed External Haemorrhoid

A thrombosed external haemorrhoid is the most common cause of a suddenly painful lump near the anus. It happens when a small blood vessel just outside the anal opening forms a clot. The onset is typically very sudden — you might go to bed completely fine and wake up with a firm, painful, blue-purple lump, sometimes after a period of straining, sitting for a long time, or heavy exercise.

The lump is tender, firm, and doesn't go back inside. The pain is usually worst for the first 48–72 hours and then gradually eases over 2–3 weeks as your body reabsorbs the clot.

If you get to a doctor within the first 72 hours, a minor procedure under local anaesthetic to drain the clot gives very fast relief. After 72 hours, the pain is already past its worst, so warm sitz baths, regular pain relief, and stool softeners are the main approach.

Perianal Abscess

A perianal abscess is a pocket of pus that forms in the tissue around the anus, usually from a blocked and infected gland. The lump is tender, warm, and may feel soft in the middle and firm around the edges. Unlike a thrombosed haemorrhoid, the pain is a constant throbbing ache — not sharp — and is there all the time, not just when you go to the toilet. Feeling feverish and generally unwell is common.

A perianal abscess won't resolve with antibiotics alone — it needs to be surgically drained. This is usually a straightforward procedure under general anaesthetic, done urgently. If left untreated, the abscess will track through the surrounding tissue or drain itself through the skin — often forming a fistula (a small tunnel) that may need further treatment later.

Skin Tags

Perianal skin tags are soft, floppy, painless folds of skin around the anal opening. They're very common and almost always completely harmless. They tend to develop from:

• Stretched skin left behind after a thrombosed haemorrhoid that has resolved
• Ongoing inflammation from repeated anal fissures (the tag that sits at the outer end of a fissure is called a "sentinel pile")
• Excess skin after previous surgery
• Crohn's disease (Crohn's skin tags tend to look more swollen and fleshy than usual)

Most skin tags don't need any treatment at all. They can occasionally cause difficulty keeping the area clean, which contributes to itching, or they may catch on clothing and cause irritation. If yours is causing these problems, they can be removed under local anaesthetic as a minor outpatient procedure.

External Haemorrhoids and Prolapsing Internal Haemorrhoids

External haemorrhoids are cushions of tissue at the anal opening — everyone has them, but they become noticeable when they swell up. A non-thrombosed (no blood clot) external haemorrhoid feels like a soft, painless bulge at the anal margin, often more prominent after straining or sitting for a long time.

Prolapsing internal haemorrhoids start inside the anal canal but, when they become large enough (Grade 3 or 4), they push down below the anal opening — appearing as a soft, moist, purple-pink protrusion when you go to the toilet. Sometimes they go back inside on their own; sometimes you have to gently push them back. Other symptoms include bleeding, mucus discharge, and itching around the anus.

Anal Warts (Condylomata Acuminata)

Anal warts are caused by the human papillomavirus (HPV) — specifically types 6 and 11 in most cases. They appear as small, soft, painless growths around the anal margin, often flesh-coloured or slightly pink, and sometimes irregular or cauliflower-shaped. There may be one or many. They can also extend into the anal canal itself.

Anal warts are sexually transmitted. They're not cancerous themselves, but ongoing HPV infection with higher-risk strains is linked to a rare type of pre-cancer (anal intraepithelial neoplasia) and eventually anal cancer. That's why it's important to get them assessed and treated, and to let any sexual partners know so they can be checked too. HPV vaccination is recommended.

Treatment options include topical creams you apply at home (imiquimod, podophyllotoxin), freezing (cryotherapy), electrosurgery, or formal surgical removal depending on the extent.

Pilonidal Disease and Sebaceous Cysts

Pilonidal disease causes a lump or pits in the crease between your buttocks — typically 3–5 cm above the anus near the tailbone, not actually at the anus itself. People often describe it as being "near the bottom," which is why we mention it here. An acute pilonidal abscess is painful and swollen; chronic pilonidal disease produces a sinus (a small channel) with intermittent discharge. See our article on pilonidal disease for more detail.

Sebaceous cysts develop from blocked skin glands in the perianal area. They're smooth, round lumps under the skin, often with a tiny visible pore at the centre. They're painless unless infected — at which point they become tender, red, and swollen. An infected cyst needs to be drained; elective removal afterwards prevents it coming back.

Anal Cancer — The Red Flag

Anal cancer is rare, but it's worth knowing what to look out for. Most cases are squamous cell carcinomas — skin-type cancers — strongly linked to HPV. In the early stages, anal cancer can look like an innocent skin tag or haemorrhoid. Features that should prompt an urgent specialist assessment include:

• A firm, hard, or irregular lump at the anal margin that doesn't have an obvious benign explanation
• A lump with an uneven, ulcerated, or non-healing surface
• A lump that doesn't change with bowel motions or straining
• A lump in someone with a history of HPV, HIV, or anal warts
• Any unexplained perianal lump that has been there for more than 4–6 weeks

If anal cancer is suspected, your surgeon will arrange a biopsy and imaging. It's primarily treated with combined chemotherapy and radiotherapy (not surgery), and outcomes are meaningfully better when it's caught early — so please don't put off getting it checked.

Frequently Asked Questions