What is the phenomenon of long hair around anus in medicine?

This is a normal physiological phenomenon and a normal genetic marker.

According to ancient books, it is normal for Scud to go to Wan Li Road every day.

Perianal hair has two advantages in human physiology: 1. Conducive to sweat gland excretion and perianal microcirculation. 2. No hemorrhoids.

Don't worry, my friend. Everything is fine.