Many people develop cold sores or so-called "fever blisters" on their lips or in their mouth. These lesions are caused by the herpes virus, and they can easily be passed on from one person to another, or even to other parts of the body. Various conditions, such as drying the lips, sunburn, a high fever, or stress can cause cold sores to erupt. The causative agent for these lesions stays in the body once you have had it. Fortunately, they heal in about one week.
These lesions can be spread easily. Be careful! There is no known cure for cold sores.
Herpetic lesions can occur in three different forms: recurrent small blisters on the lips, a generalized oral infection, or small ulcers on the palatal mucosa. The most common form is small blisters on the lips, which can be treated with low level laser therapy. Outbreaks may be triggered by sunlight, physical trauma, stress, and other irritants. Lesions will usually resolve in 10-14 days, but may be painful.