Rodent Eyebrows
If a lady got tired of having eyebrows, she was encouraged to pluck them off in Victorian times. If a person plucks their eyebrows and eyelashes consistently for years, they will just stop growing back. So, to combat that, medieval ladies would just shave rodents and harvest their hair to glue back to their faces.
Showing Off the Forehead
Medieval women thought that their foreheads were the greatest attraction of tier faces. Lots of them used makeup and plucking to make their foreheads look like large moon-like ovals. For some reason, medieval men used to go crazy over this look.