Pimples and cold sores can look similar. Cold sores cause painful blisters on the lip, while pimples typically occur on the skin around the lip. Can I pop a lip pimple? It may be tempting to pop a ...

Abscess If you notice a painful bump on the roof of your mouth, it could be an abscess—an infection that forms when bacteria ...

Erythema multiforme is an immune-mediated skin condition that may develop inside the mouth. Oral symptoms can include lesions on the lips and blisters and erosions on the gums and palate.

Symptoms most commonly appear on the inside of your cheeks. If you have leukoplakia, you may get white sores or patches on your gums, as well as on the bottom of your mouth and inside your cheeks.