How is a draining sinus tract characterized in hidradenitis suppurativa (HS)?

Updated: Nov 20, 2020
  • Author: Marina Jovanovic, MD, PhD; Chief Editor: William D James, MD  more...
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The inflamed nodules progress when spontaneously draining dermal sinus tracts appear. Draining sinuses represent a variant of persistent nodular hidradenitis suppurativa characterized by periodic discharge of pus or blood. If untreated, the draining sinuses persist for a long time, even years. They may seem to intermittently resolve, only to start draining again (see the images below). A draining sinus can be easily identified because of its linear or angular shape and its history of being present for a prolonged period. Over time, multiple abscesses and sinus tracts form a subcutaneous honeycomb. Occasionally, the involvement extends into the underlying fascia and muscles. Fibrosis, hypertrophic scarring, and induration ultimately develop.

Sinus tract. Sinus tract.
Draining sinus tract. Draining sinus tract.

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