Why cold sores appear and people lips?!
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It really isn't known for sure why some people break out with cold sores and others don't. Some think that it could be stress triggered. It is a type of herpes like the other users did say.
Please follow the link for more information.
"The herpes simplex virus (HSV) (also known as Cold Sore, Night Fever, or Fever Blister) is a virus that manifests itself in two common viral infections, each marked by painful, watery blisters in the skin or mucous membranes (such as the mouth or lips) or on the genitals. The disease is contagious, particularly during an outbreak, and is incurable with present-day technology. An infection on the lips is commonly known as a "cold sore" or "fever blister," though this should not be confused with a canker sore, which appears inside the mouth and is not caused by the herpes simplex virus."
Other Answers:
Because it's a herpes outbreak.
herpes simplex . it's a virus
Herpes, it's a virus and is usually triggered by something. Stress, a cold, fever, anything that weakens your system will trigger an outbreak.
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