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One of the main causes of mouth sores and dry lips is the warm, trapped moisture in your mask. The damp environment is the perfect breeding ground for a host of bacteria and leads to problems such as acne flare-ups around the mouth (yikes!).
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Speaking of bacteria, there is a highly notorious one called candida, which particularly thrives in the damp environment in your mask. So, if you are someone who has dry lips and is used to licking them, you are unknowingly creating a very comfortable home for this bacteria to grow in. Sounds gross, but it's true. When both these factors – the moisture from your breath and saliva from the constant licking — come together, it leads to them getting trapped in the crevices and lines around your mouth, leading to soreness around the mouth as well as chronic dry lips.
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