Pilonidal Sinus: What That Painful Lump Near Your Tailbone Might Mean
A pilonidal sinus is one of those conditions many people have never heard of — until they have it. If you've noticed recurring pain, swelling, or a discharge near the top of your buttock cleft (just above the tailbone), a pilonidal sinus could be the cause.
While it may sound alarming, it is a well-understood condition with excellent treatment outcomes, especially when addressed early.
What is a pilonidal sinus?
A pilonidal sinus is a small tunnel or hole in the skin, usually located in the cleft between the buttocks near the tailbone (coccyx). 'Pilonidal' literally means 'nest of hair' — the condition is often associated with hair follicles in the area becoming trapped under the skin, creating a tunnel that can become infected.
It is significantly more common in people who sit for long periods (office workers, drivers, students) and in those with dense body hair.
How does it develop?
- Hair and debris accumulate in the cleft of the buttocks
- Friction and pressure (from sitting) can drive loose hair beneath the skin
- The body reacts to this foreign material with an inflammatory response, which can develop into an abscess
- Once an abscess forms and drains, it may leave behind a sinus tract — a small tunnel — through which further discharge occurs
Symptoms to watch for
A small dimple or pit in the skin near the tailbone
Pain, redness, or swelling in the lower back / upper buttock area
A lump that grows, becomes tender, and eventually drains
Pus or blood-stained discharge with an unpleasant odour
Hair visible in or around the sinus opening
Difficulty sitting comfortably for extended periods
Fever in cases of significant infection
Who is most at risk?
Young adult males (particularly 15–35 years old) are most commonly affected, though the condition can occur in women too.
Risk factors include:
Why it shouldn't be ignored
Warning:
An untreated pilonidal sinus rarely resolves on its own. It typically progresses — the sinus can enlarge, develop multiple tracts, and in severe cases, the infection can extend towards the underlying bone. Early treatment, when the sinus is small and the infection minimal, leads to simpler procedures and better outcomes.
Laser Pilonidoplasty — the minimally invasive solution
At Aegis Surgical Hospital and Laser Piles Center, Dr. Ratnadip Sonawane performs Laser Pilonidoplasty — a procedure where a laser fibre is introduced into the sinus tract. The laser energy destroys the lining of the tract and any hair inside it, causing the tunnel to collapse and heal.
No large excision, no open wound, and no prolonged period of wound dressing.
Laser Pilonidoplasty benefits:
Other treatment options
For minimal or uncomplicated cases:
Flap surgery (a reconstructive technique that reshapes the cleft to reduce recurrence risk) is an excellent option.
For infected sinuses:
Surgical drainage of the abscess as a first step, followed by definitive treatment once the infection settles.
For complex cases:
Open excision surgery remains an option for complex multi-tract sinuses, though recovery is longer.
After treatment: preventing recurrence
Regardless of the treatment approach, some practical steps significantly reduce the chance of a sinus returning:
- Regular hair removal from the area (waxing, laser hair removal, or trimming)
- Maintaining a healthy weight
- Taking regular breaks from prolonged sitting
- Maintaining good personal hygiene in the area
Don't Put It Off Any Longer
If you've been suffering with a recurring lump or discharge near your tailbone, book a consultation with Dr. Ratnadip Sonawane at Aegis Surgical Hospital and Laser Piles Center.
Email: aegispilescare@gmail.com