After the main quest all over，my character grows a beard，what should i do？
lol))
There are several options.
Searching an abandoned witch's house is better when you have her quest activated. Find a potion there that will remove the beard, or the witch can do it if the time matches.
Take a large book from the table in the witch's house and talk to Martha about cosmetic magic. Learn a spell to remove the beard.
Or show the beard to the Valkyries... Beatrice will clean your beard)