What is a Pilonidal Sinus?
A pilonidal sinus (also called a pilonidal cyst or sacrococcygeal sinus) is a small tract that forms in the natal cleft — the groove between the buttocks — usually just above the tailbone. Inside the tract, small hairs and skin debris often collect. Over time, the trapped hair and constant friction of the area can cause repeated inflammation, infection and abscess formation.
Some people notice only a small painless dimple or opening for years, while others develop recurrent painful swellings, discharge and difficulty sitting. Because the area is exposed to sweat, pressure and friction, symptoms tend to come and go.
Symptoms of Pilonidal Sinus
- A painful, tender swelling at the top of the buttock cleft
- Redness, warmth and increasing pain (during an acute abscess)
- Discharge of pus, blood or clear fluid from a small opening in the skin
- Foul smell or staining of undergarments
- Difficulty sitting for long periods or during long travel
- One or more small pits or openings in the natal cleft with visible hair
- Fever or generalised discomfort when an abscess flares up
Between flare-ups, the area may look quite settled, which sometimes leads to the problem being ignored until another episode of infection occurs.
What Causes a Pilonidal Sinus?
The exact cause is not fully understood, but current understanding suggests that loose hairs are pushed into the skin of the natal cleft by pressure, friction and movement. The body reacts to these hairs as foreign material, forming a small tract and, eventually, a chronic sinus.
Common contributing factors include:
- Thick body hair and hirsutism
- Deep natal cleft anatomy
- Prolonged sitting (long-distance drivers, desk-bound work, students)
- Obesity and increased pressure over the tailbone area
- Excessive sweating and warm climate
- Friction from tight clothing
- Poor hygiene of the natal cleft area
- Previous trauma or irritation to the area
Who is at Risk?
When Should You See a Surgeon?
You should consider a surgical consultation if you notice any of the following:
- A recurrent painful swelling near the tailbone or top of the buttocks
- Persistent discharge of pus, blood or fluid from an opening in that area
- Small pits or openings in the natal cleft with visible hair
- Fever with severe pain and swelling over the tailbone (suggests an abscess)
- Difficulty sitting, working or travelling due to discomfort in the area
Do not ignore repeated tailbone abscesses: Recurrent infections can enlarge the sinus, create side branches and make definitive treatment more involved. Early evaluation helps in planning simpler options.
Diagnosis
Diagnosis is usually made by clinical examination. The surgeon looks for the characteristic pits and openings in the midline of the natal cleft, checks for tenderness, swelling and discharge, and assesses whether the sinus is quiet or actively infected. In most cases, no special tests are needed. In selected or recurrent cases, an ultrasound or MRI may be advised to define the extent of the tract.
Treatment Options
Treatment depends on whether the sinus is causing an acute abscess or is a chronic, quiet sinus, as well as its size and any history of previous surgery. The main aims are to control infection, remove the sinus tract and reduce the chance of recurrence. Your surgeon will discuss the most suitable approach for your case.
Conservative measures
For very mild or early cases, hygiene of the area, regular hair removal (shaving, trimming or laser), weight control and avoidance of prolonged sitting may help reduce symptoms. However, conservative measures alone often do not close an established sinus tract.
Incision and drainage (for acute abscess)
When there is a painful, swollen abscess, the first step is usually to drain the pus. This relieves pain quickly and controls the infection, but it does not remove the underlying sinus, which may need definitive surgery later.
Open excision
The sinus and surrounding affected tissue are removed and the wound is left open to heal from the base upwards. Healing may take longer, but recurrence rates can be low when the wound heals well.
Excision with primary closure
The sinus is excised and the wound is stitched closed. Healing may be quicker if the wound heals without complication, but the midline closure has its own considerations that your surgeon will explain.
Flap procedures (Limberg, Karydakis)
Techniques such as the Limberg flap or Karydakis flap reshape the natal cleft so that the closure line is moved off the midline. These procedures are often considered for larger or recurrent sinuses to reduce the chance of recurrence.
Minimally invasive options
Selected patients may be candidates for minimally invasive techniques such as sinus laser closure or endoscopic pilonidal sinus treatment. Suitability depends on the size and pattern of the sinus and is decided after clinical evaluation.
Recovery After Pilonidal Sinus Surgery
Recovery depends on the procedure performed. Open wounds usually need regular dressings and take longer to heal completely, while primary closure and flap procedures may allow earlier return to routine activity if healing is uneventful. Most patients are advised to avoid prolonged sitting, heavy lifting and driving for a period after surgery. Your surgeon will provide individualised advice on wound care, activity, hygiene and follow-up visits.
Preventing Recurrence
- Keep the natal cleft area clean and dry
- Regular hair removal in the area — shaving, trimming or laser hair reduction
- Avoid very prolonged sitting; take short breaks during long drives or work hours
- Maintain a healthy body weight
- Wear loose, breathable clothing and change out of sweaty clothes promptly
- Attend follow-up visits so that any early recurrence can be detected and treated
Frequently Asked Questions
What is a pilonidal sinus?
A pilonidal sinus is a small tunnel or cyst in the skin near the top of the buttock cleft, often containing hair, that can become inflamed or infected.
Is a pilonidal sinus the same as a pilonidal cyst?
The terms are often used interchangeably. "Cyst" is used when the collection forms a swelling, while "sinus" refers to the tract or opening in the skin. Both describe the same underlying problem.
Can a pilonidal sinus heal without surgery?
Mild cases may settle temporarily with hygiene and hair removal, but the sinus tract usually persists. Recurrent or symptomatic sinuses generally need surgical treatment.
What happens if I keep getting abscesses?
Repeated abscesses can enlarge the sinus and create additional branches, making treatment more involved. It is better to have the sinus evaluated after the acute infection settles.
Which surgical options are available?
Options may include open excision, excision with primary closure, flap procedures such as Limberg or Karydakis flap, and selected minimally invasive techniques. The choice depends on the size, extent and recurrence pattern of the sinus.
How long is recovery after surgery?
Recovery varies with the technique used. Open wounds take longer to heal but have their own advantages, while flap procedures may allow earlier return to routine activity. Your surgeon will advise you individually.
Can pilonidal sinus come back after surgery?
Recurrence is possible. Regular hygiene, hair removal, weight control and following your surgeon's post-operative advice help reduce this risk.
Is pilonidal sinus surgery covered by mediclaim / health insurance?
Pilonidal sinus surgery is generally covered under most health insurance policies. Madhav Hospital offers mediclaim / insurance facility — please confirm coverage with your insurer.
Consult Dr. Bhavesh Panchal for Pilonidal Sinus Evaluation
Get a proper evaluation and understand the most suitable treatment plan for your condition at Madhav Hospital, Thakkarbapanagar, Ahmedabad.