A swollen tongue may signal allergies, deficiencies, infections, or deeper health issues you shouldn't ignore.

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.

Biting the tongue and burns from hot foods or liquids can cause a swollen bump for a few days. Herpes simplex virus type 1 (HSV-1) is a viral infection that can cause cold sores around the mouth.