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Pilonidal Sinus (Pilonidal Disease)
The image shows a lesion in the intergluteal (natal) cleft, in the sacrococcygeal region, with the following features:
- Multiple midline pits/sinus openings - the hallmark finding
- Surrounding hyperpigmentation and erythema - indicating chronic inflammation
- Puckered, indurated skin with irregular texture
- Hair debris visible within the pits
This is classic for a Pilonidal Sinus.
What is a Pilonidal Sinus?
A pilonidal sinus is a chronic inflammatory condition of the skin and subcutaneous tissue of the sacrococcygeal region. The name comes from Latin: pilus (hair) + nidus (nest).
Pathogenesis:
- Loose hairs (often coarse, stiff hairs from the back/buttocks) are driven into the skin by friction and pressure (e.g., prolonged sitting)
- The hair acts as a foreign body, triggering a foreign-body granulomatous reaction
- Sinus tracts form and can become secondarily infected, leading to abscess formation
- More common in young adult males, hirsute individuals, and those with deep natal clefts
Clinical Stages:
| Stage | Presentation |
|---|---|
| Asymptomatic | Incidental pits, no symptoms |
| Acute abscess | Painful, fluctuant swelling with purulent discharge |
| Chronic sinus | Persistent or intermittently discharging sinus tracts |
| Complex/recurrent | Multiple sinuses, scarring, previous failed surgeries |
Management:
- Acute abscess - incision and drainage (I&D), followed by definitive surgery
- Chronic sinus - surgical excision options include:
- Lay-open (open excision) - simple but slow healing
- Excision with primary closure
- Limberg/Karydakis flap - preferred for recurrent/complex disease (lowest recurrence rate)
- Adjuncts - depilation (shaving, laser), good hygiene, weight management
Red flags requiring urgent referral:
- Significant pain, swelling, fever (acute abscess needing drainage)
- Discharge that is bloody or has changed character (rare malignant transformation to squamous cell carcinoma in longstanding cases)
Note: This is a clinical image interpretation for educational purposes. A formal surgical evaluation is recommended for definitive diagnosis and treatment planning.
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