Swollen lips may be caused by allergic reactions, injuries, chapping or sunburn, infections, and cysts called mucoceles. The swelling comes from either inflammation or built-up fluid under the skin.

Angioedema, a type of swelling that affects the skin and tissues of the body, commonly affects the lips. Angioedema is a type of swelling that affects the deep tissues of the skin and other systems.

Lip cancer is a type of head and neck cancer that develops on the skin of the lips when cells that make up the lip grow out of control and form tumors. It can occur anywhere on the lips, but it most ...