Is a pimple inside the nose ever a sign of something else? What looks like a nose zit may actually be something else entirely, like a cold sore... You could actually have a cold sore (yep ...

They commonly pop up on the inside of the lip or cheeks. Canker sores have a litany of causes including trauma, hormonal changes, stress, and food allergies, explains Hannah Kopelman, D.O., a ...