Fever blister pain

The discomfort often comes from inflammation, cracking, and exposure of sensitive skin as the blister forms and heals. Do not pick or peel the crust, because this can reopen the surface and spread the virus to nearby skin.

The clinical term for a fever blister is herpes labialis. It is caused by herpes simplex virus, commonly HSV-1, and typically appears as a tingling or burning area followed by small fluid-filled blisters at the lip border.

Pain can be worse when the lesion rubs against a tooth, toothbrush, food, or dry skin. A sore on the inner cheek, gums, or palate may have a different cause, so its location matters when identifying the problem.

Place a clean, cool, damp cloth on the lip for short periods, keep the area clean, and apply a plain protective ointment to reduce cracking. Choose soft, cool foods if chewing or acidic foods irritate the sore, and drink enough fluid.

For pain, an adult may use an over-the-counter medicine such as paracetamol or ibuprofen only if it is suitable for them and used exactly as directed on the label. A dentist, doctor, or pharmacist can check interactions and medical conditions; a prescribed antiviral works best when started early in the outbreak.

Arrange a dental assessment if the sore is inside the mouth, keeps returning, does not start healing, becomes increasingly red or swollen, or makes eating and drinking difficult. The dentist can examine the lip, teeth, gums, and oral lining and distinguish herpes labialis from a traumatic ulcer, bacterial infection, or another lesion.

Seek prompt medical care if the sore is near an eye, there are widespread blisters, severe illness, or a weakened immune system. Do not share lip products, cups, cutlery, or kisses while the blister is active, and wash your hands after touching the area.

Ask whether the location and appearance fit herpes labialis or another mouth sore, whether an antiviral is appropriate at this stage, and which pain medicine fits your medical history. Also ask how to protect a cracked lip and what changes would require a review.

If the blisters recur, ask about triggers, prevention, and whether a recurring pattern needs medical assessment. Bring the date the tingling began, any medicines you have used, and a list of conditions or allergies.