Causes and Risk Factors

• The exact cause is not fully known, but it is believed to occur due to hair penetrating the skin and causing infection.
• Prolonged sitting (drivers, office workers)
• Excess body hair
• Poor hygiene
• Obesity
• Excessive sweating
• Family history
• Friction or repeated irritation in the area

Symptoms of Pilonidal Sinus

• Pain near the tailbone
• Swelling or lump in the lower back
• Redness and tenderness
• Pus or blood discharge
• Fever (if infection spreads)

Diagnosis is usually based on

• Physical examination
• MRI or CT scan (for large or deep lipomas)