Many who regularly wear facemasks have opted for permanent cloth ones, rather than the disposable kind. Healthcare professionals have no such option, so hospitals are stocked with disposable facemasks (when they're in stock). That means facemask dispensers are needed.
A perusal of medical supply websites shows that these have received a minimum of design attention, and their doesn't appear to be any standard (nor standout) design:
Only a couple of dispensers even take the packaging they come in into account:
And I did find one bizarre design that resembles a Xenomorph from the Alien franchise: