I've developed a white sore on my lower lip. It looks like something similar to a cold sore but it's on my lip, not inside the lower lip. It's become almost solid and made the right third of my lip swell. The spot is about the size of a dime and has a milky white color, it started as a small spot that looked like I had just bitten my lip too hard but that's solidified now and the spot is now under the skin. I'm not sure if I should go to a doctor, dermatologist or if I should just wait it out. It's been three days and it's just gotten worse.