What can cause a bump on the lip — and when should it be medically assessed?

A bump on the lip can result from cold sores (herpes simplex virus), mucoceles, allergic reactions, blocked glands, trauma, or less commonly, precancerous changes. In this episode, we explain the most common causes of lip lesions and how doctors assess them across Europe.

You’ll learn:

• The difference between fluid-filled blisters (cold sores) and painless mucus cysts (mucoceles)

• How lip trauma, biting, or irritation can lead to localised swelling

• Signs of bacterial infection versus viral lesions

• When a lip bump may indicate angular cheilitis or contact dermatitis

• Red flag features: persistent ulceration, bleeding, rapid growth, colour change, or unexplained weight loss

• When antiviral treatme ...