At a glance
A pilonidal sinus is a small tunnel or cavity that forms in the skin at the top of the buttock crease, near the tailbone. The word “pilonidal” means “nest of hair” — loose hairs are thought to work their way into the skin, causing irritation and eventually a tract or pocket.
This condition is common in younger adults, particularly those in their late teens through thirties. People who sit for long periods, have more body hair in the area, or have a deeper natal cleft may be more likely to develop one.
This page covers what people commonly experience, what tends to help or make things worse, and when to seek care.
What people commonly experience
- A small dimple or pit at the top of the buttock crease that may go unnoticed for some time
- Pain, tenderness, or swelling near the tailbone — sometimes appearing suddenly
- Redness and warmth over the area during a flare-up
- Drainage of fluid or pus, which may have an unpleasant smell
- Difficulty sitting comfortably, especially on hard surfaces
- Symptoms that come and go — some people describe quiet periods followed by painful flare-ups
Acute flares vs chronic sinus
Acute flare-ups often involve a rapid increase in pain and swelling. The area may become an abscess — a collection of pus that feels hot and extremely tender. Some abscesses drain on their own. Others need medical drainage.
Chronic pilonidal sinus is when the tract persists over time. People may notice ongoing or intermittent drainage, recurring infections, or discomfort that never fully resolves between flare-ups. Chronic cases are more likely to be discussed in terms of surgical options.
Treatment options people report
- Conservative care — keeping the area clean and dry, removing hair from the area (shaving or other methods), and warm compresses during mild flares.
- Incision and drainage — a doctor drains the abscess. This provides relief but the sinus tract may remain.
- Surgery — several surgical approaches exist, ranging from excision with open healing to flap procedures. The best option depends on the individual case. Your doctor can walk you through what they recommend and why.
- Ongoing hair removal — many people report that keeping the area free of loose hair helps reduce recurrence after treatment.
What tends to help
- Keeping the area clean and dry
- Regular hair removal around the natal cleft — people commonly mention shaving, depilatory creams, or laser hair removal
- Avoiding prolonged sitting when possible, or using a cushion
- Warm compresses or sitz baths during mild discomfort
- Wearing loose, breathable clothing
- Maintaining a healthy weight — this is sometimes mentioned as helpful for reducing pressure on the area
What tends to make things worse
- Prolonged sitting, especially on hard surfaces
- Tight clothing that causes friction in the area
- Allowing hair to accumulate in the natal cleft
- Ignoring early signs of a flare-up
- Sweating and moisture buildup in the area
Talking to your doctor
If you are considering seeing a doctor, it can help to note:
- When you first noticed symptoms
- How often flare-ups occur and how long they last
- Whether you have had any drainage and what it looks like
- What you have already tried
- How symptoms affect your daily life — sitting, working, exercising
- Whether anyone in your family has had a similar condition
Many people feel self-conscious about discussing this area of the body. Doctors see pilonidal sinuses regularly and can help you find the right approach.
If you experience severe pain, heavy bleeding, fever, or symptoms that concern you, seek medical care.