The cold sore will go through three phases as it erupts. Though the symptoms may vary, most people experience:  Tingling, itching, or burning before the sore is visible. Blisters. The blisters are most common along the edge of your lips, but may also be present on your nose or cheeks. Small children may also get them in their mouths. The blisters break open and ooze liquid, then form a crust. The blisters usually heal within two weeks but it may take as long as a month. The first outbreak is generally the worst. You may also have other symptoms including:  Fever Headache Enlarged lymph glands Sore throat Gum pain Muscle pain Cold sores will usually heal without medical attention, but if this doesn’t occur or you experience complications, you should get checked by a doctor. Go to a doctor if:  Your immune system is suppressed. This may be the case for people with HIV/AIDS, who are undergoing cancer treatments, have severe burns, eczema, or are taking anti-rejection drugs after an organ transplant.  Your eyes are irritated or infected. The cold sores recur frequently, do not heal in two weeks, or are very severe.
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