Drainage of pilonidal abscess

A pilonidal abscess is a collection of pus in the natal cleft — the soft area between the buttocks. It almost always develops from a pre-existing pilonidal sinus (a small pit or tract that traps hair and debris under the skin). When the sinus blocks up and gets infected, the result is an abscess.

Drainage is a short surgical procedure. A small incision is made over the most prominent part of the abscess, the pus is released, the cavity is gently cleaned, and the wound is left open to heal from the inside out. Relief is usually rapid — most people feel substantially better within hours.

Drainage is needed whenever a pilonidal abscess is diagnosed. The classic picture is:

• A painful, swollen, hot, exquisitely tender lump in the natal cleft
• Pain that has been getting steadily worse over a few days
• Sometimes a fever or feeling generally unwell
• Sometimes discharge of pus if the abscess has started to drain on its own

Once a pilonidal abscess has formed, antibiotics alone are not enough — the pus has to be released. Antibiotics may be added afterwards if there is significant surrounding infection, but they are not a substitute for drainage.

• Rapid pain relief — drainage releases the pressure, and most people feel a marked improvement within hours
• Short procedure — usually 10–20 minutes, often under a short general anaesthetic for comfort, occasionally under local anaesthetic if the abscess is small and very superficial
• Day procedure — you go home the same day
• Resolves the acute infection so the area can settle before any discussion of definitive treatment for the underlying sinus

Drainage of a pilonidal abscess is safe, but a few things are worth knowing:

• Recurrence is common. Drainage treats the acute infection, but it does not deal with the underlying sinus that caused the abscess in the first place. In published series, around 30 to 60 in every 100 people who have had one pilonidal abscess will eventually need definitive surgery for the sinus.
• Wound healing can be slow — the natal cleft is a moist, hairy, awkward area for wound healing. Most wounds take 2–4 weeks to fully close.
• Bleeding from the drainage site is uncommon.
• Spread of infection beyond the immediate area is rare.

Most drainage procedures are arranged urgently — sometimes the same day. Standard fasting instructions apply for any general anaesthetic — see the Fasting Instructions guide.

If your abscess is exquisitely tender, please do not be put off coming in. Drainage is short, done under anaesthetic, and brings rapid relief.

Drainage is usually performed under a short general anaesthetic, although a local anaesthetic is occasionally enough for a small superficial abscess.

• You will be admitted briefly to the day-stay unit at Warringal Private Hospital or Epworth Eastern
• The anaesthetic team will help you off to sleep — you will not feel anything
• A small incision is made over the most prominent part of the abscess to release the pus. The cavity is gently cleaned and a small gauze pack may be placed.
• The whole procedure takes 10–20 minutes
• You wake up in recovery already feeling better, and go home after a short observation period

• The first 24 hours — the severe pain from the abscess is gone almost straight away. Some mild discomfort at the wound is normal. Paracetamol and ibuprofen are usually all that is needed.
• Wound care — the wound is left open and any pack will fall out on its own within a few days. Daily showers and gentle cleaning are encouraged. Pat dry — do not rub.
• Sitz baths (sitting in a warm shallow bath for 10 minutes a few times a day) are helpful — they keep the area clean and comfortable.
• Healing — most wounds close over 2–4 weeks. The same general principles apply as in the Pilonidal Aftercare guide.
• Hair removal — hair removal is not routinely recommended after a single episode. If your pilonidal disease keeps coming back, or your individual circumstances make it appropriate, hair removal may be advised — and laser is preferred over shaving in those cases. This is discussed individually at follow-up.

Drainage treats the acute infection, but the underlying pilonidal sinus is still there — and that is why recurrence is common. Once the area has fully healed (typically 6–8 weeks), follow-up is the time to assess whether definitive surgery is recommended. Definitive surgery means excision of the sinus, often with a Dermabond Prineo closure — see the Pilonidal Aftercare guide for what that involves.

Not everyone needs definitive surgery — some people manage well long-term after a single episode with good hygiene alone. The conversation is unhurried and based on your specific pattern of disease.

Mr Nguyen prefers a small, targeted incision over the abscess at drainage — large radical excisions in the acute infected setting often leave wounds that struggle to heal. The acute episode is managed simply and effectively, with the conversation about definitive treatment of the underlying sinus deferred until everything has settled. Routine hair removal is not part of Mr Nguyen's standard recommendation after a single episode — it is considered on an individual basis at follow-up, and laser is preferred over shaving where it is advised.

Have questions about this procedure?

If you have questions or would like to be seen, Mr Nguyen consults at his rooms in Heidelberg and operates at Warringal Private and Epworth Eastern. A GP or specialist referral is needed to make an appointment.

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