They could be an obstacle because of the need for social distancing and keeping them disinfected.
Health experts say they can be a petri dish for diseases like coronavirus.
Features that we previously thought were sanitary can now be potential transmitters.
"The hand drying blower is a wonderful machine to spread germs and aerosols and droplets throughout the room," says Eric Feigl-Ding, scientist at Harvard University.
Experts say possible solutions include making bathrooms touchless, marking off sinks and toilets, removing doors from bathroom entrances and adding covers to toilets.