A preauricular sinus is deeper than a preauricular pit. The sinus tract is lined with a stratified squamous epithelium. The tract of a preauricular sinus may become chronically infected and emit a painless, foul-smelling, milky discharge.
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![Infected Preauricular Sinus [left]](https://medtube.net/images/min/b2a376c3b648e197301f2029f597aaea/750/750/3)
![Infected Preauricular Sinus [left]](https://medtube.net/images/min/b2a376c3b648e197301f2029f597aaea/120/120/3)
![External Auditory Canal Junction [the Isthmus]](https://medtube.net/images/min/ed89ef2b09553cecbd7125f5b3fd1867/115/70/1 "External Auditory Canal Junction [the Isthmus]")
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