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Cold sores are small, painful, fluid-filled blisters on the mouth or nose.
After the first episode of the disease, the virus lies dormant in the nerves or skin around the original area until something sets the virus off into another eruption. Colds, flu, and even stress can cause you to have an outbreak of cold sores. Why you have an outbreak at one time of life and not another is not clearly understood. HSV-1 is a very common virus. The first symptom that may appear during an outbreak of cold sores may include tingling, burning, or itching in the area around the mouth or nose.