I too Have a very large V. malfurmation on my back.. its puffy and sometimes becomes very irritated. It made be very self concsious when I was younger, but now it still does only sometimes. The truth is that most people are very curious, and sometimes you should not get their curiousity confused with disgust or even judgement. It must be so difficult for those with facial birth marks like this, but I cant say anyting but, be brave to you. People who love you will love you regardless of what you look . No body is perfect and there are far worse perdicaments to be in in life than what you are going through, not to minimize your experience in anyway.
Hang in there and dont let ignorance keep you unhappy. Your life has meaning and you are loved, never forget that.