Hi Doctor, I'm a 38 year old female. I have a black round spot under skin on my lower lip. It's the same place where I broke my lip about 8 years ago, when I fell and my tooth cut the lower lip through. It was bleeding on the outside and inside, then recovered. I always have a hard spot there, but recently it became dark - almost like a dark bruise under skin, but I didn't hurt myself in anyway recently. So is it something I should worry about? It's not painful when I touch it. I don't feel differently in any other way. But now the black spot on my lower lip is quite obvious, about the size of a piece of cooked rice... not that long, but about the width of it. Thanks.