Lump on Anus: 8 Causes, When to Worry & Treatment

A lump on the anus is a common concern and is most often caused by hemorrhoids, but it can also be linked to conditions such as anal warts, abscesses, skin tags, or, more rarely, cancer. The lump may appear suddenly or develop over time and can vary in size, texture, and level of discomfort.

Depending on the cause, a lump on the anus may be accompanied by symptoms such as pain, bleeding, itching, swelling, or discharge, although it can sometimes be the only noticeable sign. These symptoms help distinguish between mild conditions and those that require closer medical evaluation.

Treatment for a lump on the anus can range from home measures like sitz baths and ointments to medications, minor procedures, or surgery, depending on the diagnosis. Medical evaluation may include a physical exam, anoscopy, or biopsy, especially when symptoms persist, worsen, or raise concern for infection or cancer.

Why is there a lump on my anus?

A lumps or bump near the anus can be caused by:

1. Hemorrhoids

Hemorrhoids are the most common cause of anal lumps. They occur due to the dilation of a vein, which appear as a small, soft “ball” in the anal region. In these cases, you may feel other symptoms like pain with bowel movements or bleeding in the stool. These lumps can present internally (which is when they are felt but not visible to the eye) or externally (when they are visible and palpable). 

Generally, hemorrhoids are more common in people with a family history of them and in people who have chronic diarrhea or constipation. They can also occur in people who stand for long periods throughout the day or perform strenuous activity frequently. Learn more about what can cause hemorrhoids. 

How to treat: In most cases, hemorrhoids can be managed by having a diet that is rich in fiber with adequate fluid intake (at least 2 L per day, or half a gallon per day). To treat discomfort, you can perform sitz baths, while intense pain can be treated with an analgesic or steroid ointment. These medicated ointments can be applied for 5 to 7 days. Read more about medications and home remedies you can use to treat hemorrhoids at home.

2. Anal warts

Warts are small skin nodules that can appear pink or white. They can appear in the anal region and normally do not cause any pain or discomfort. They are usually caused by an HPV infection in the area. Anal warts can cause some local itching and some mild bleeding which is noted while wiping. You may also feel a strange mass in the anus. 

Generally, this type of infection is most common in people who engage in unprotected anal sex, especially with more than one partner. Learn more about the different types of warts that can occur.

How to treat: You should see a doctor to assess the lesions and prescribe treatment as necessary. Treatment usually involves cryotherapy, podophyllum 25% ointment or immune therapy. 

3. Perianal abscess 

Although this is more rare, a perianal abscess can lead to a lump near the anus. The abscess is made up of pus that emerges due to an infection in the area. It can occur due to a blocked gland or a sexually transmitted infection. 

In addition to the presence of a lump in the anus, you may also feel symptoms like intense pain, anal swelling or rigidness in the area. 

How to treat: In almost all cases, the pus from an abscess is aspirated by a doctor. In more serious cases, when the abscess is large, for example, it may need be surgically removed to help with healing in the area. 

4. Molluscum contagiosum

Molluscum contagiosum is a skin condition caused by a pox virus that is characterized by small skin lumps. These can also affect the perianal region. This condition is more common in adults who engage in unprotected anal sex. 

How to treat: Treatment is very similar to that of anal warts. These lumps can be managed with prescription ointments which contain salicylic acid, or an antiviral. Many times, the doctor may also suggest cryotherapy or laser therapy to destroy the lesions. 

5. Anal cancer

This is the rarest cause of anal lumps, but it is also the most serious. It should be identified as soon as possible by a doctor to ensure a higher cure rate. In these cases, in addition to lumps, you may also feel constant pain, itching, difficulty with bowel movements or blood in the stool. Be sure to know the general signs and symptoms of cancer. 

How to treat: Treatment is usually monitored by an oncologist and normally involves chemotherapy or radiation therapy. However, a small tumor can also be removed surgically. 

6. Anal skin tag

An anal skin tag is associated with the growth of excess tissue in the anus which can occur due to chronic inflammation in the area. This can be triggered by hard stool, inflammatory bowel disease, hemorrhoids or infection in the area. 

How to treat: Generally speaking, treatment is not necessary. However, the gastroenterologist may recommend surgical removal of the skin tag if it is large or when there is a greater risk for infection. 

7. Anal fissure

An anal fissure is a small wound or crack in the anus, which can lead to anal swelling and the formation of a lump in the anus.

Other symptoms of an anal fissure are anal bleeding, pain, discomfort and burning when pooping.

An anal fissure can develop as a result of constipation, or it can be the consequence of injuries from anal sex (from lack of lubrication, for example).

How to treat: Symptoms of an anal fissure can be relieved with anesthetic ointments. To promote skin healing, you doctor can also prescribe ointments with zinc oxide.

It is also important to maintain proper perianal hygiene. You should also avoid using toilet paper, and instead cleanse the anal region after bowel movements with water or moistened wipes.

8. Perianal hidradenitis suppurativa

Perianal hidradenitis suppurativa is characterized by chronic inflammation of hair follicle around the anus, which can lead to the appearance of a lump in the anus.

In addition to the lump, other symptoms include pain or sensitivity in the area, itching, redness, or even discharge from the lump.

Perianal hidradenitis suppurativa can be caused by hormonal changes, Crohn's disease, obesity, or a family history of this condition.

How to treat: Treatment is guided by a gastroenterologist and usually involves the use of topical or oral antibiotic, immunosuppressant medications, or corticosteroid injections.

In more severe cases, the doctor may advise reparative surgery.

How is an anal lump diagnosed?

Diagnosing the cause of a lump on anus usually involves a clinical evaluation combined with targeted exams, depending on symptoms and physical findings.

Common diagnostic methods include:

• Digital rectal exam, which allows the doctor to feel for internal lumps, tenderness, or abnormalities in the anal canal.

• Anoscopy or proctoscopy, which uses a short, lighted tube to visualize the inside of the anus and rectum and helps identify hemorrhoids, fissures, warts, or inflammation.

• Biopsy, which may be performed if the lump appears irregular, firm, or persistent and cancer is suspected.

These exams help distinguish between benign conditions and more serious causes that require prompt treatment.

Step-by-step guide to a sitz bath

A sitz bath is commonly recommended to relieve discomfort caused by a lump on anus, especially when related to hemorrhoids, fissures, or inflammation.

1. Fill a bathtub or sitz bath basin with warm water, making sure it comfortably covers the anal area.

2. Sit in the water for 10 to 15 minutes, keeping the area fully submerged.

3. Perform the sitz bath 2 to 3 times per day, especially after bowel movements.

4. Gently pat the area dry with a clean towel after finishing.

5. Avoid adding soap, salt, or antiseptics unless specifically recommended by a healthcare professional.

Regular sitz baths can help reduce pain, swelling, and irritation while supporting healing of the affected area.