Pain or a tender lump at the top of the cleft between the buttocks is a common presentation of pilonidal disease. Small pits or sinus openings can trap hair and debris, leading to inflammation, discharge or an abscess. Symptoms may appear suddenly or recur over months or years. The correct treatment depends on whether there is an acute abscess or an established sinus.

Symptoms of pilonidal disease

You may notice pain when sitting, redness, swelling, bleeding or pus leaking from one or more openings. Discharge may have an unpleasant smell. An acute pilonidal abscess can become intensely painful over a short period and may be accompanied by fever. Between flare-ups, there may be little more than a small pit or intermittent staining of clothing.

Why does it happen?

Loose hairs can become embedded in the skin of the natal cleft, causing inflammation and sinus tracts. Friction, sweating, prolonged sitting, coarse hair and a deep cleft may contribute. It is not caused by poor hygiene, although keeping the area clean and dry can support symptom control.

How is it diagnosed?

Diagnosis is usually based on the location and examination. Your surgeon will look for pits, active drainage, an abscess and the extent of any openings. Imaging is not routinely needed but may be considered when the diagnosis is uncertain, disease is extensive or another perianal condition is possible.

Treatment

A painful abscess usually needs incision and drainage, sometimes with antibiotics. Recurrent or persistently discharging pilonidal disease may be treated with excision, an off-midline closure, laying open of the sinus or selected minimally invasive techniques. The most appropriate option depends on the extent of disease, previous treatment and available expertise.

When to seek urgent help

Seek prompt assessment for rapidly worsening pain, spreading redness, fever or difficulty sitting because an abscess may need same-day drainage. Do not try to puncture the swelling yourself.

Frequently asked questions

Can a pilonidal abscess burst by itself? Yes, but drainage does not necessarily treat the underlying sinus and recurrence is possible.

Is pilonidal disease the same as a skin cyst? No. It involves pits and sinus tracts in the buttock cleft and requires different treatment planning.

Can it return after surgery? Yes. Recurrence risk varies with disease extent, technique, healing and individual factors.