Can Pilots Have Beards, Mustache, and Facial Piercings?
The answer is no, and there’s a reason for it. To fly safely, pilots must wear an oxygen mask that fits correctly on their faces. The precise fit required makes it difficult for pilots to have beards or piercings.

This is to ensure nothing goes wrong; only tiny tufts of hair are permissible. There will be no issue using the oxygen mask as a result of this. So don’t be shocked if a pilot is always clean-shaven.