The NHS says that mouth ulcers are common, and most of them are harmless. But sometimes, they say, ulcers ― small, usually circular sores that form on the inside of your lip, inner cheek ...

They're mouth ulcers, also known as aphthous ulcers or canker sores, and typically occur on the inner cheeks, inner lips, ...

Ayora said she should have never tried to fix what wasn't broken, as a "botched job" left her needing two additional injections to try and fix it, and later gave her a rare lip ulcer. "I regret ...