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The signs and symptoms that you mentioned in your question most closely relate to a perianal cyst.

A cyst is an abnormal sac with a membranous lining that contains fluid, semisolid material, or just gas.

Cysts are very common and can occur at any age, anywhere in the body. There is no specific age group that is more likely to develop cysts, and no specific cause. Cysts can be caused by infections, chronic inflammatory conditions, or even simple obstructions to the flow of fluid. A cyst typically presents as a pea-sized lump anywhere on the body.

Cysts are usually painless but there is a possibility of developing an infection in the cyst. Such a cyst is known as an "infected cyst", and is filled with pus. An infected perianal cyst typically presents with perianal soreness, swelling, and tenderness.

The pain gets worse when pressure is put on it. On examination, an infected cyst is seen with inflammation around the infected area. This cyst can be seen with the naked eye and can rupture spontaneously resulting in temporary relief of symptoms. In some cases, these cysts grow from the size of a pea to the size of a grapefruit. In such cases, emergency surgery is required. If not treated, the cyst may rupture -- leading to complications.

The symptoms you mentioned are not suggestive of an external hemorrhoid.

Hemorrhoids are inflamed and swollen veins in your lower rectum and anus.

They can be internal and external. An external hemorrhoid is easily detectable and can be seen with the naked eye. It is closely related to bleeding and constipation. The pain is severe in most cases.

There is another type of cyst that can cause the similar symptoms. This cyst is called an epidermal inclusion cyst. It is a very common type of cyst which occurs when skin tissues become trapped under normal skin. The tissues trapped under the skin form a cyst cavity filled with dead cells and secreted oils.

Regardless of the exact diagnosis, you need to see a doctor, preferably a colorectal surgeon.

If the bump is painful and the pain keeps worsening with time, minor surgery is recommended. Some cases are treated with antibiotics and painkillers only.

You don't seem to be suffering from something serious, such as cancer. But still, you need some medical attention. You are advised to get a blood test known as complete blood count (CBC). It will help obtain the correct diagnosis. If the cyst is infected, or if there is any abscess or infection, your blood test will show a raised "white blood cells (WBC)" count and "erythrocyte sedimentation rate (ESR)".

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