The Hair in the Sinus: Sharp‐Ended Rootless Head Hair Fragments can be Found in Large Amounts in Pilonidal Sinus Nests

Short hair fragments with rootless sharp cut ends were found within pilonidal sinus cavities. Morphologically, these fragments resemble short cut rather than intact body hair. Since short cut hair, e.g., derived from the head potentially enters the pilonidal cavity more easily than longer hair, the source of these cut hair fragments needs to be eliminated when aiming to prevent Pilonidal Sinus Disease.