Perineal Cyst: What It Is and When It Needs Draining

A perineal cyst is a fluid-filled sac that develops in the perineum—the area between the genitals and the anus. While many of these cysts are harmless and may disappear on their own, some can become painful or infected, requiring medical attention and, in certain cases, drainage.

What Is a Perineal Cyst?

• Definition: A perineal cyst is a closed sac under the skin in the perineal area, often filled with fluid, pus or semi-solid material.
• Location: The perineum extends from the pubic bone to the tailbone, and from one sit-bone to the other.
• Types of Cysts in This Area:
  • Epidermal inclusion cysts
  • Bartholin’s gland cysts (in people with vulvas)
  • Mucinous cysts
  • Skene’s gland cysts

Most perineal cysts grow slowly and are painless unless they become irritated or infected.

Common Causes and Risk Factors

Cysts form when normal skin structures or glands get blocked or trapped. Factors that may contribute include:

• Minor trauma or friction in the perineal region (tight clothing, prolonged sitting)
• Blocked hair follicles or sweat glands
• Infection by bacteria or yeast
• Hormonal changes in puberty or pregnancy
• Prior surgeries or scars near the perineum

Signs and Symptoms

Perineal cysts often start small and unnoticed. Watch for:

• A small lump or bump under the skin
• Soft, movable mass—varying from pea-sized to a few centimeters
• Occasional mild discomfort, especially when sitting or during bowel movements
• Redness, warmth or tenderness if infection develops
• Leakage of a thick, cheesy fluid if the cyst ruptures

Most cysts stay benign. However, any signs of rapid growth, worsening pain or discharge merit prompt evaluation.

When a Perineal Cyst Needs Draining

Not every perineal cyst requires drainage. Indications include:

• Persistent or increasing pain
• Signs of infection: redness, swelling, heat and fever
• Rapid enlargement in size over days to weeks
• Interference with daily activities (sitting, walking, hygiene)
• Repeated rupture and re-accumulation of fluid
• Abscess formation (a painful collection of pus)

If you notice these changes, drainage by a trained healthcare professional may be the safest and most effective option.

The Drainage Procedure

When indicated, draining a perineal cyst is usually an outpatient procedure. It can be done under local anesthesia:

1. Cleaning the Area: The skin is prepped with antiseptic solution.
2. Numbing: A local anesthetic is injected around the cyst.
3. Incision and Drainage: A small cut is made to release fluid or pus.
4. Culturing (if infected): Fluid may be sent to a lab to identify any bacteria.
5. Packing (in some cases): A small gauze strip may be placed to prevent the cyst from closing too quickly and allow ongoing drainage.
6. Dressing: The area is covered with a sterile bandage.

This procedure typically takes 10–20 minutes. You’ll feel some pressure but minimal pain.

Aftercare and Recovery

Following drainage, proper care helps prevent recurrence or infection:

• Keep the area clean and dry.
• Change dressings as instructed (often twice daily).
• Avoid tight clothing and strenuous activity for a few days.
• Warm sitz baths (15 minutes, 2–3 times a day) can soothe discomfort and promote healing.
• Take prescribed antibiotics if an infection was present.
• Watch for renewed redness, swelling or fever—signs that you should contact your doctor.

Most people recover fully within 1–2 weeks. If the cyst returns, a more definitive surgical removal may be recommended.

Preventing Perineal Cysts

While you can’t always prevent cysts, these steps can lower your risk:

• Wear breathable, moisture-wicking underwear.
• Practice good perineal hygiene—gently wash daily with mild soap.
• Avoid prolonged sitting; stand and stretch every hour.
• Treat skin irritations or minor infections promptly.
• Consider hair removal methods that don’t irritate follicles (avoid harsh shaving).

When to Seek Medical Advice

Although perineal cysts are usually benign, certain situations require urgent attention:

• High fever (over 38°C/100.4°F)
• Severe pain that doesn’t improve with over-the-counter pain relief
• Rapidly spreading redness around the cyst
• Difficulty walking, urinating or having bowel movements
• Persistent bleeding or foul-smelling discharge

If you’re unsure, you might try a free, online symptom check, using the doctor approved Ubie Symptom Checker to get personalized guidance. If symptoms seem serious or life-threatening, always speak to a doctor as soon as possible.

Key Takeaways

• A perineal cyst is a fluid-filled lump in the area between genitals and anus.
• Most are benign but can become painful or infected.
• Drainage is recommended for infected, growing or very uncomfortable cysts.
• The procedure is quick, done under local anesthetic, with low risk.
• Good hygiene, breathable clothing and prompt care of minor irritations help reduce chances of cyst formation.
• Seek medical attention for high fever, severe pain or signs of spreading infection.

Perineal cysts can be managed effectively when you know what to watch for and when to get help. If you have any doubts or symptoms that worry you, please speak to a doctor to rule out serious complications.