Wow, this is so ironic because I literally just came back from the dentist today. Actually, I've been to a few different dentists a lot in the last month or so, so I've had a lot of this going on. I hate having people too close to my face because it makes me incredibly self conscious and the dentist is like the definition of up close and personal. I also have braces, so every so many weeks there's another appointment

I especially love when they want to show you what they did so they give you the handheld mirror because all I can see is the marks under my makeup. Ugh. And when I get x-rays of my mouth done and I have to stand in place, when I look straight ahead there' s a mirror really close to my face. Perfect!
Funny story, sort of. About a month and a half ago, I went in to have my last two wisdom teeth taken out. My skin was really bad and I refused to go in without makeup, even though I knew how sore I'd be when I left. Anyway, I was awake for the entire hour it took to drill etc. I felt blood splash back on my face(not to freak anyone out because although it sounds gory, it was perfectly fine and I'm a wuss with dentists). Anyway, when they were done the nurse started wiping my face down, wiping off my makeup along with the blood. I looked like a mess when I left, half makeup, half blood, half acne. And then about 2 weeks later I needed another surgery done because of my braces and my f'ed up teeth and not only did I have an oral surgeon in my face, I had his assitant and a 2nd year med student! Aweomse, right? And when he was done he says, "Sorry, I messed your makeup up a bit."
I'm sort of getting used to this now, although everytime I go, I feel self-concious about it. I just try to ignore the face that someone's face is right close to mine and can see everything. It bothered me a lot more in the beginning and when there are serious breakouts and I have to do it, it bothers me more but trust me, I'm right there with you.