Symptoms of a cold sore
The primary infection of the herpes simplex virus can develop in different ways. It may cause mild symptoms or no symptoms at all. After the primary infection, with or without symptoms, the virus lies dormant in your body but can reactivate and cause blisters on the lips (cold sores). If you get cold sores you may experience some unusual sensations around your lips and mouth signalling that a cold sore is about to develop. Many people report the following symptoms during an outbreak:
Symptoms may not start for up to 20 days after exposure to the herpes simplex virus, although it’s more typical for cold sores to appear within about one week of exposure. Cold sores usually clear up within about two weeks. Recurrent outbreaks usually occur in or around the same place each time, and it’s possible to have three or more cold sore outbreaks a year.