Symptoms

When it's infected, a pilonidal cyst becomes a swollen mass (abscess). Signs and symptoms of an infected pilonidal cyst include:

• Pain
• Reddening of the skin
• Drainage of pus or blood from an opening in the skin
• Foul smell from draining pus

When to see a doctor

If you notice any signs or symptoms of a pilonidal cyst, see your doctor. He or she can diagnose the condition by examining the lesion.