Acne definitely triggered social anxiety for me. Like so many others on here before acne I had a normal social life, but after a few years of acne problems I'm now very shy and have virtually no social life to speak of. At one point the anxiety was so bad I would actually crisscross the street as I was walking to avoid people looking at my face. For me the anxiety issues have been by far the worst symptom of my acne and unfortunately it's proving very hard to fix.
That being said.....I've found that by taking small steps to put myself in "harms way" now means I have far better control over the anxiety. It can be something as small as answering a question in class or continuing small talk with a check out operator. I still feel quite nervous in a lot of social situations but it is slowly getting easier and I'm doing things I would never have dared to earlier on in the year.
Of course it would be nice if the acne would just go away