Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The skin redness measurement after wearing the KF94 mask. The skin redness measurements before and after wearing the mask for forehead and cheeks (A). The rate of change in skin redness according to the time of wearing the mask compared with before wearing the mask (B)
