Pilonidal disease (a pilonidal sinus) is a chronic condition in the area above the cleft of the buttocks, where hair and debris get trapped under the skin and form a sinus that can become inflamed. It is common in young adults, mostly men. An acute abscess needs prompt drainage for relief; chronic or recurrent disease is treated definitively with an individualised choice — from modern minimally invasive techniques (pit picking, EPSiT, laser) to surgical excision with a flap. Good aftercare and hair removal reduce the risk of recurrence.
Pilonidal disease is one of the most common conditions in young adults — and one of the most frustrating, because it tends to recur if it is not treated well. The good news is that today there are several options, from very gentle to more definitive.
What is pilonidal disease?
Despite the common name "cyst", this is not a cyst in the usual sense but a pilonidal sinus: a small tunnel under the skin, in the area above the cleft of the buttocks (the sacrococcygeal region). Hair and dead cells get trapped there and cause chronic inflammation, which can periodically become infected.
Symptoms
- Asymptomatic pit: one or more small openings in the midline, with no discomfort.
- Acute abscess: intense pain, swelling, redness and warmth — often with discharge of pus.
- Chronic sinus: persistent or intermittent discharge (pus or blood), discomfort when sitting.
Why it appears
Contributing factors include heavy hair growth, a prolonged sedentary lifestyle and friction, a deep natal cleft, higher body weight and family history. This is why it is more common in young men.
Diagnosis
Diagnosis is mainly clinical: the surgeon recognises the characteristic midline pits and assesses the extent of the disease. Imaging is rarely needed.
Treatment: from the acute abscess to a definitive solution
Acute abscess. The priority is incision and drainage, which brings immediate relief. However, this is usually not a definitive solution — the disease can recur.
Modern minimally invasive techniques. For selected cases these offer small wounds and faster recovery:
- Pit picking (Bascom technique): removal of just the small pits through tiny incisions.
- EPSiT (endoscopic treatment): cleaning of the sinus under direct vision, without a large incision.
- Laser and chemical curettage (phenol) in selected cases.
Surgical excision. In more extensive or recurrent disease, removal of the affected tissue may be combined with:
- Off-midline closure (e.g. the Karydakis technique) or a flap (e.g. Limberg), which move the scar away from the midline and reduce recurrence.
- Open healing (by secondary intention), with regular dressing changes — simple but with slower healing.
Preventing recurrence
After treatment, the risk of recurrence is significantly reduced by hair removal in the area (laser hair removal is particularly effective), good local hygiene, maintaining a healthy weight and avoiding prolonged pressure and friction.
Recovery
Recovery time depends on the technique: minimally invasive methods allow a quick return to activities, while open wounds need weeks of regular dressing changes. A related condition is an anal fistula or abscess. See the full page on pilonidal disease and the services.
What is pilonidal disease?
It is a chronic condition in the area above the cleft of the buttocks (the sacrococcygeal region), where hair and debris get trapped under the skin and form a sinus (tunnel) that can become inflamed. It is common in young adults, mostly men.
Does it always need surgery?
An acute abscess needs prompt incision and drainage for relief. A small, asymptomatic pit may simply be monitored with good hygiene and hair control. Recurrent or chronic disease usually needs a definitive procedure, which is individualised.
What are the modern minimally invasive techniques?
Techniques such as pit picking, endoscopic treatment (EPSiT) and laser offer smaller wounds and faster recovery, but suit selected cases. More extensive or recurrent disease may need surgical excision with a flap.
How long does recovery take?
It depends on the technique: minimally invasive methods usually allow faster recovery, while open wounds heal over weeks with regular dressing changes. The exact time is individualised.
How do I reduce the risk of recurrence?
Hair removal in the area (including laser hair removal), good local hygiene, maintaining a healthy weight and avoiding prolonged sitting pressure and friction all help.