Medically reviewed by William Truswell, MD Cold sores and pimples are two common skin conditions that primarily affect the ...

You just noticed a painful red bump on your lip. Is it a cold sore or a pimple? Sometimes it can be tough to tell. "It can be ...

"Both lip pimples and cold sores can pop up on the border of the lips, and a lip pimple can be mistaken for a cold sore," says Ko. However, cold sores, also known as oral herpes, are caused by the ...