Cold sores usually start with tingling, itching, or burning on the lip border before small blisters appear. The blisters then break, crust over, and heal over about a week or a little longer. The episode is annoying, but it is usually limited and self-limited.
The key is to act early, keep the area protected, and avoid spreading the virus to other people or to your own eyes.
What a cold sore usually looks like#
Cold sores often start with a warning phase. The skin feels tender, tingles, or burns, and then the blisters appear. They are usually local rather than spread evenly over the whole lip area.
If the lips are simply dry and peeling all over, the problem may be dryness rather than herpes. Dry lips need protection, but they are a different condition.
What can trigger an outbreak#
Triggers vary from person to person. Common ones include another infection, fever, fatigue, stress, poor sleep, strong sunlight, or local irritation. For some people the pattern becomes predictable after a while, which makes early action easier.
What helps at home#
Early treatment matters most. If a person is prone to cold sores, starting care as soon as tingling begins is often more useful than waiting for blisters to open. Keeping the area clean and avoiding picking at crusts helps the skin heal without repeated injury.
If the outbreak is painful, ordinary pain relief may help if it suits your situation and you follow the package instructions. A clinician may also decide whether a prescription antiviral is appropriate, especially if outbreaks are frequent or severe.
How to reduce spread#
Avoid kissing and direct contact with the sore while it is active. Do not share lip products, drinking bottles, or cutlery during the outbreak. Wash hands carefully after touching the area, and avoid rubbing the eyes.
Extra caution is sensible around newborns and people with weakened immunity, because the virus can be more serious for them.
When it may not be a simple cold sore#
If the eye hurts, becomes light-sensitive, or the outbreak is near the eye, it needs prompt review. A widespread rash, severe first outbreak, or marked swelling also deserves assessment.
When to seek care#
Seek care if the sore is near the eye or if there is eye pain, light sensitivity, or vision change. Review is also important if the blisters spread widely, the skin looks strongly infected, or the outbreak is unusually severe. Seek help urgently if breathing becomes difficult.
Further reading and sources#
Further reading: