Once you have the virus that causes cold sores, it stays in your body for the rest of your life. But it can be inactive for long periods.Causes of a cold sore..1. Kissing someone who has a cold sore.2. Sharing a drinking glass, eating utensils, or lip balm with someone who has a cold sore.3. Having oral sex with someone who has a cold sore.Symptoms can include:1. A blister-like sore or cluster of sores. These often occur at the edge of the lips but may appear inside the mouth.2. Skin redness around the sores.3. Pain or itching in the area of the outbreak. Often the pain or itching develops 12 to 24 hours before the sore become visible.4. Flu-like symptoms, including swollen glands, headache, body ache, or fever. These typically occur only at the time of the first infection.
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