BBC journalist Imogen James explains the trend and takes us through how and if these at-home LED masks work. Rio Rennalls from the What in the World team tells us why he uses one. Some dermatologists ...

And you may be curious about the red-glowing masks that you’ve seen making the rounds on social media. Red-light masks use low levels of light-emitting diode, or LED, to stimulate skin cells, says Dr.

P95 and N95 are rating classifiers for masks manufactured to keep people from inhaling dust and other small particles in unsafe environments.