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Image of the measuring areas by skin characteristics. Mask‐wearing area: 2, 3, 4, 5, 6, 9; non–mask‐wearing area: 1, 7, 8; skin temperature and sebum: 1, 2, 3, 4; trans‐epidermal water loss (TEWL): 4, 6; recovery of skin barrier: 8, 9; skin hydration: 1, 2, 3, 4, 7; skin redness: 1, 2; skin elasticity: 2, 7
