In short
- Diagnosis is clinical: midline pits plus discharge or swelling confirm it in most cases.
- A gentle probe maps the tract path so surgery removes all disease with a small margin.
- Scans are reserved for complex or repeat cases — not every patient needs one.
Who this page is for
Pilonidal sinus is a frequently observed disease in young adult males. It starts as tiny pits in the buttock cleft. Hair and debris collect there and form tunnels under the skin.
This page is for anyone with cleft discharge, repeat swelling, or a non-healing spot near the tailbone. It walks through the consult step by step. Most patients leave the first visit with a clear answer.
What the exam looks for
The exam starts with a look at the cleft. The doctor searches for midline pits — tiny dark dots in a row. One pit can be enough. Most patients show two or three.
Next come secondary openings. These sit off the midline, often to one side. They leak pus or blood-stained fluid during flare-ups. Old scars from past bursts count too.
Touch adds the rest. The doctor feels for cords under the skin. These cords link pits to side openings. Tender, warm swelling points to active infection.
Look-alikes get ruled out at this stage. A perianal fistula opens near the anus, not the cleft. Hidradenitis forms boils in many body folds. A plain boil lacks pits entirely. Patients unsure about the difference can read pilonidal vs hidradenitis and perianal fistula before the visit.
How tracts get mapped
Pits are only the surface. Tracts run beneath. Mapping finds their full path. This map keeps surgery complete yet small.
Mapping follows three steps:
- Pit count — each midline pit is noted in order from top to bottom.
- Gentle probing — a thin blunt probe slides into the tract to trace its length and side branches (doctors call this diagnostic probing).
- Skin marking — the tract outline is drawn on the skin so the flap plan matches the disease.
Probing is brief. It takes seconds per tract. Numbing gel keeps it tolerable. The doctor stops if pain rises sharply.
The map matters because missed branches cause repeat disease. A full map lets the surgeon clear every tunnel. It also keeps margins tight, which means a smaller scar.
Seek same-day care for these signs
- Rapid painful swelling with fever — likely an acute abscess needing staged drainage first
- Red streaks spreading from the cleft, or foul heavy discharge
- Inability to sit or walk from cleft pain
When scans are needed
Most cases need no scan. The exam plus probe map is enough. Scans enter only for complex tracts.
Two scans are used:
- Endoanal ultrasound — a small probe shows shallow tract layers near the cleft.
- MRI — detailed slices show deep or branching tracts and repeat-disease paths.
Timing counts. Scans during acute swelling mislead. Oedema blurs tract borders. The better order is drainage first, imaging later. Patients with a hot swelling should read why surgeons delay flap surgery during infection.
Dye injection into tracts is not essential. Guidelines note it adds little. A careful probe map beats blue dye in most hands.
Key figures from published series
- Pilonidal sinus is a frequently observed disease in young adult male patients, traditionally treated surgically with growing use of small-incision options for limited disease.
- A Dufourmentel flap series for pilonidal sinus disease (Journal of the Royal Medical Services) reports a rate of 20% (reported rate for the endpoint as published).
- A Z-plasty series for pilonidal sinus (n=18) reports a rate of 90% (reported rate for the endpoint as published) — context only; the clinic does not offer Z-plasty.
What Dr. Vishal Purohit does in Jaipur
Dr. Vishal Purohit treats pilonidal sinus disease in Jaipur. The first visit covers the pit exam, gentle tract mapping, and a same-day diagnosis in most cases. Scans are ordered only when branch tracts or repeat disease need them.
For treatment the clinic performs definitive Limberg and Karydakis off-midline flap surgery, plus abscess drainage for acute infection. Phenol, laser, endoscopic, pit-picking, Bascom, Dufourmentel, and Z-plasty procedures are not offered; they appear here only as literature context. To understand the starting point, patients may read what pilonidal sinus disease is. This is educational information, not medical advice.