pilonidal sinus
A pilonidal cyst is a fluid- or air-filled sac that forms in the crease of the buttocks, often caused by a skin infection and ingrown hairs. It can be acute (one-time) or chronic (recurrent). If untreated, it may lead to abscesses or sinus cavities.
Symptoms:
- Pain, especially when sitting.
- A red, tender dimple or swollen area between the buttocks.
- Drainage of foul-smelling pus or blood.
- Nausea, fever, or fatigue in severe cases.
Who is at risk?
- Men (3–4 times more likely than women).
- Ages 20–35.
- People who sit frequently, have overweight/obesity, or thick body hair.
- Tight clothing wearers.
Causes:
While not fully understood, pilonidal cysts are often linked to ingrown hairs that cause infections.
