I have long hair in my buttock groove, which hurts after sitting or walking for a long time.

Hello: the hair you said is a normal victory phenomenon. Pay attention to the pain I suspect that you have eczema caused by moisture. I suggest you go to the anorectal department of the hospital for an examination. After eczema caused by anal diseases is eliminated, it is recommended that you rinse and dry with light salt water every day, keep the skin around the anus clean and dry, and wear underwear with good air permeability.