What are the symptoms?

The symptoms of cold sores

The first symptom of a developing cold sore is often a tingly or burning feeling where it is about to appear on the lips.

It's also common to be quite itchy around this area as well. This itchy, tingling feeling tends to last from a few hours up to 1 day.

Look closely at the tingling area - you're looking for slight redness and maybe a slightly raised area.

The skin over the cold sore area continues to become a little puffy, as a blister forms. Once the blister comes to the surface and dries to form a scab, the skin continues to heal and return to normal.