Hi, overnight a tiny black dot (upon closer inspection, looks the color of blood - dark red) has appeared just inside my lower lip. It is very small, about 1/4 the size of a pencil eraser. Its has no texture, it is not raised in anyway (smooth to the though as if nothing is there) and does not hurt at all. I am 28, 6 2 - weigh 155lbs, caucasian, healthy and do not smoke. Yesterday I got some sunburn on my neck from being outside a bit too long. What is this spot and what could it potentially mean?