Portrayals of the archetypal plague doctor costume of beak-like mask, ankle-length waxed overcoat, gloves, boots, wide-brimmed hat, linen hood, and overcoat date to the early modern period.

The first known written description of an herbal-stuffed beak mask was during the 1656–1658 epidemic in Rome.

https://en.wikipedia.org/wiki/Plague_doctor

Those masks aren’t medieval