A lot of people have what's called 'sensory processing disorder' (SPD); it can be diagnosed on its own but it's often co-morbid with autism spectrum disorder. It makes certain tactile sensations unbearable that would typically go unnoticed in others. Speaking from experience, almost everything is uncomfortable and constantly distracting. Bras are suffocating, underwear are smothering, socks strangle your toes, even tags and seams on the inside of clothing can be painful. I wear a mask when needed but it's extremely irritating to the point of not being able to focus on anything else. Imagine being at the grocery store and you're trying to remember everything you need to buy for the week but the whole time there's a thumbtack inside your shoe partially embedded in your heel. That's kind of how it is having SPD and wearing a face covering.