I sell face creams and am well aware that severe germs and bacteria get caught inside the mask as we received many complaints from people thinking it was our moisturiser causing their pimples/rashes etc

In each case we asked for photos and in each instance the rashes/pimples were exactly in the shape of their mask only:

https://dailysceptic.org/2022/....05/02/the-foegen-eff

The Foegen Effect: Why Face Masks Increase the Death Rate of COVID-19  The Daily Sceptic

The Foegen Effect: Why Face Masks Increase the Death Rate of COVID-19 The Daily Sceptic

A Medicine article proposes the Foegen effect to explain why the Covid fatality rate increases with mask usage: deep re-inhalation of condensed droplets which were trapped in the mask can worsen outcomes.