The symptoms of cold sores may not always be visible during the initial attack (the primary infection). However, you may experience flu-like symptoms and ulcers in and around your mouth. However, once the cold sore has developed and becomes more severe, you may notice blisters around your mouth (usually around the edges of your lower lip), or on your lips.
Even though each person may experience different symptoms of cold sores, some of the common signs of cold sores include:
Tingling or burning sensation on your lips, usually before the cold sores become visible
Small blisters around your mouth or lips, that grow, burst, ooze a clear fluid, and then form scabs. Occasionally blisters may form around your nose or on your cheeks.
Irritated, dry and itchy lips and mouth
Soreness or pain felt in your lips or around your mouth, which may make eating, drinking a sleeping difficult.
Other symptoms might include:
An outbreak can usually be set off by a trigger, such as exposure to sunlight, stress or fatigue or food allergies. Consult your doctor if you have any of the symptoms of cold sores, or if you feel like a cold sore may be reoccurring.