Hi, my dd2, now 5.5 mo, developed a strawberry mark in her left armpit a few weeks after birth. I looked them up in my book and it seems fairly standard - appeared as a very small line (thought it was a crack in the skin with blood in it at first), grew, stopped growing. Says they disappear around about the 2 yo mark - Any experience with this anyone? Can they turn into something nasty or be an indicator of any other problem?