Keep getting fever blisters

Recurring fever blisters are usually cold sores caused by herpes simplex virus, but mouth ulcers and other lesions can look similar.

Cold sores often start with tingling, then form grouped blisters on the lip before crusting as the virus reactivates in sensory nerves.

Cold sores often start with tingling, then form grouped blisters on the lip before crusting as the virus reactivates in sensory nerves.

The relevant anatomy, material, or mechanism determines which explanation fits the symptoms and which treatment can help.

Keep the area clean, wash hands after touching it, and avoid kissing or sharing utensils while active.

Use the product or self-care measure only for its intended purpose, follow its directions, and avoid using it to conceal worsening symptoms.

Seek care for an eye lesion, severe widespread sores, dehydration, immune suppression, or a lesion that does not heal.

A dental examination can identify the cause and guide cleaning, medication, restoration, appliance care, or referral.

Ask whether the lesion is a cold sore or another ulcer and whether antiviral treatment is appropriate.

Ask what finding would change the plan and which warning signs should prompt earlier contact.