They happen to almost every child. I remember when Lyn had quite a few. They are caused by a common virus. A homemade way to get rid of them is to break the top open by gently scratching them to expose the center then treat with tea tree oil with a carrier oil. I added frankincense and a drop of oregano essential oils. Top it off with charcoal bamboo band aids. After a week or so of treatment and they should be gone.