Summary
- A perianal abscess is an infection beneath the skin around the anus caused by trapped bacteria and pus formation.
- Common symptoms include a painful lump near the anus, swelling, pus discharge, and discomfort when sitting or passing motion.
- Some perianal abscesses may be associated with a fistula-in-ano, which can cause recurrent drainage from the same area.
A swollen, painful lump near the anus can make sitting, walking, or passing motion uncomfortable. You may even be alarmed to see pus discharge in the same area.
What’s going on? Do you have a perianal abscess or piles? What are the differences between all these conditions, and should you see a colorectal surgeon in Singapore immediately? Read on to find out.
What Is a Perianal Abscess?
A perianal abscess is an infection that causes a collection of pus to form beneath the skin around the anus, common among men and women aged 30 to 50.
It’s also the most common type of anal (anorectal) abscess, which is a broader term used for infections that develop near the anus or rectum.
How a Perianal Abscess Develops
Inside the anal canal are small glands that help lubricate bowel movements. Sometimes, these glands can become blocked. When bacteria become trapped inside, an infection may start to develop.
As the body responds to the infection, inflammatory fluid and pus begin collecting within the tissue. This can cause increasing discomfort and swelling around the anus.
Certain conditions may increase the risk of developing a perianal abscess, including inflammatory bowel disease, diabetes, or a weakened immune system. However, abscesses can also occur in people without any underlying medical condition.
Why Infection Can Cause Swelling and Pus Near the Anus
Your immune system responds to infection by sending white blood cells and inflammatory fluid to the affected area. This build-up forms pus.
As more fluid collects, the surrounding tissue may become swollen, red, warm, and tender. In some cases, pus may also drain through the skin near the anus.
What Are the Common Symptoms of a Perianal Abscess?
Perianal abscess symptoms often become more noticeable over several days as the infection and swelling increase. While some people initially mistake the problem for piles or skin irritation, symptoms related to infection typically continue progressing rather than settling.
A Painful Lump or Swelling Near the Anus
You may notice:
- A lump that feels soft, firm, or tight beneath the skin
- Pain or tenderness around the anus
- Increasing discomfort over several days
Redness, Tenderness, or Warmth Around the Area
The surrounding skin may become:
- Red or inflamed
- Warm to touch
- Tender during walking, wiping, or sitting
- More sensitive as the swelling worsens
Pus Discharge or Leakage Near the Anus
You may also experience:
- Pus or fluid draining from the area
- Yellowish or foul-smelling discharge
- Staining on underwear
Pain When Sitting or Passing Motion
You may experience:
- Pain when sitting
- Discomfort during bowel movements
- Pain when coughing or straining
- Avoidance of bowel movements because of discomfort
Fever or Feeling Unwell
More severe infections may sometimes cause:
- Fever
- Chills
- Fatigue
- A general feeling of being unwell
Do any of these symptoms sound familiar? If yes, then you should consider having the area medically assessed. Book a consultation with Dr Bernard Lim, a colorectal surgeon in Singapore, for a professional diagnosis and treatment recommendation.
Could It Be Piles?
Not every painful lump near the anus is caused by a perianal abscess. Haemorrhoids (piles) can sometimes produce similar symptoms, especially in the early stages.
How Haemorrhoids (Piles) Usually Present
Haemorrhoids are swollen blood vessels around the anus or lower rectum. They’re more commonly associated with:
- Bleeding during bowel movements
- Itching or irritation around the anus
- Mild discomfort or a feeling of fullness
- A soft lump near the anus
External haemorrhoids can occasionally become painful, particularly if a clot develops inside them. However, they do not usually cause pus discharge or fever.
Is It a Perianal Abscess? Here’s How You Can Tell
Symptoms | Perianal Abscess | Piles (Haemorrhoids) |
Painful lump near the anus | ✓ | ✓ |
Pain that worsens over several days | ✓ | ✕ |
Pus or fluid discharge | ✓ | ✕ |
Fever or chills | ✓ | ✕ |
Redness or warmth around the area | ✓ | Sometimes |
Bleeding during bowel movements | ✕ | ✓ |
Pain when sitting or passing motion | ✓ | Sometimes |
Why Should Abscess Symptoms Not Be Ignored?
Perianal abscesses do not always improve on their own. In some cases, the infection can spread deeper into surrounding tissues or continue recurring after an abscess drainage.
When Pain or Swelling Continues to Worsen
Symptoms that continue progressing over several days may suggest that the underlying problem is not resolving. This may include:
- Ongoing difficulty sitting or walking normally
- Increasing discomfort despite using piles creams or home remedies
- Swelling that becomes larger or tighter over time
- Pain that starts interfering with sleep or daily activities
Why Pus or Discharge May Suggest Infection
Persistent discharge may indicate that infected fluid is still collecting beneath the skin. This can sometimes happen when the underlying tract connected to the infection remains present.
When Fever or Increasing Pain May Need Medical Attention
A medical assessment may become more important if the symptoms are affecting your overall health or continue worsening rapidly.
Can a Perianal Abscess Lead to a Fistula?
Yes. In some cases, a perianal abscess can later develop into a fistula-in-ano.
What a Fistula-in-Ano Is
A fistula-in-ano is a small abnormal tunnel that forms between the anal canal and the skin near the anus. It usually develops after an abscess infection creates a persistent tract beneath the skin.
Why Some Abscesses May Continue Draining
In some cases, the opening connected to the tract remains active after the abscess settles.
This can result in:
- Recurrent discharge from the same spot
- Intermittent swelling
- Episodes of discomfort that repeatedly return
How Are Perianal Abscesses Usually Managed?
Treatment depends on how large or deep the abscess is, as well as whether surrounding tissues are involved.
When Abscess Drainage May Be Recommended in Singapore
A drainage procedure may sometimes be recommended to remove trapped pus and reduce ongoing inflammation.
This may be considered when there is:
- Significant swelling beneath the skin
- Persistent discomfort
- Ongoing drainage
- Concern that deeper tissues are involved
Depending on the location and severity of the abscess, the abscess drainage may be performed under local or general anaesthesia.
What Should You Do if You Notice Swelling or Pus Near the Anus?
If you’re dealing with persistent swelling, worsening pain, or pus discharge near the anus, you should not ignore the symptoms or assume they will resolve on their own.
While some anal lumps may be caused by piles or superficial skin infections, others may involve a deeper infection that requires medical treatment.
An early assessment may also help reduce the risk of ongoing infection, recurrent abscesses, or fistula formation.
Speak With a Colorectal Surgeon in Singapore
At Dr Bernard Lim Specialist Surgery, patients undergo evaluation for conditions affecting the anus and lower rectum, including perianal abscesses and fistula-in-ano.
Following an assessment, treatment recommendations are tailored based on the location of the condition, whether deeper anorectal tissues are involved, and whether further procedures may be required.
