The only masks I had on hand at the beginning of the Wuhan were a couple of N95's. Didn't wear one until I finally got a haircut in June. Wore an N95 and developed a terrible rash around my mouth. Coincidentally had a 6 month doctors appointment the following week and the doc noticed the rash and said that it is a quite common allergy.
So, I ain't wearing one of those damn things again.