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. 2021 Apr 29;85(2):225–232. doi: 10.1111/cod.13855

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© 2021 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd

This article is being made freely available through PubMed Central as part of the COVID-19 public health emergency response. It can be used for unrestricted research re-use and analysis in any form or by any means with acknowledgement of the original source, for the duration of the public health emergency.

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Skin properties on the face, including (A) hydration, (B) transepidermal water loss (TEWL), (C) erythema, (D) sebum values, (E) pH, and (F) skin temperature. P‐values <.05 are significant. *P < .05, **P < .01, compared with baseline. #P < .05, ##P < .01, ###P < .001, compared with the uncovered area. V0: Baseline; V1: 4 hours after wearing the respiratory protective equipment (RPE); V2: 8 hours after wearing the RPE; V3: 14 hours after taking off the RPE. Abbreviations: KCA, KF94 respirator‐covered area; KUA, KF94‐uncovered area; MCA, medical mask–covered area; MUA, medical mask–uncovered area