i always seem to get pimples or something around my mouth, on the outside of my lips, etc. usually, it's right in the corner of my mouth. the skin is a little tender to the touch a few hours before it actually appears, but it isn't red or raised. and when it does appear, it just looks like a normal pimple - if i pop it, puss comes out, just like normal. however, then it kind of scabs over. it gets a little bit red, and kind of...crusty. it goes away after a few days. however, i was wondering if this was normal, or if it could be a cold sore? i'm sixteen, if that helps, and for the most part my skin's pretty clear. it's just these...random spots that are pretty periodic. as in, every few weeks or so. help?