It makes sense that growing a beard during this time could put you and those around you at a greater risk of contracting COVID-19. It has to do with how the mask fits your face.
Any opening can increase the chance that there is a virus that will get to your orifices, which can then potentially give you the disease.
Speaking of beards and the pandemic. Check out this time lapse video of one being grown!
And to answer this question...should you shave?