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Cold Sores or Fever Blisters Caused by Herpes Type I Virus
These are painful, fluid-filled blisters on the lips, under the nose and on the chin. Cold sores are caused by a virus and are very contagious. They are often triggered by a fever, illness, skin injury, sunlight, menstruation or stress. After they erupt on the skin, they dry up and form scabs that eventually fall off. Fever blisters usually last about seven to ten days.
Treatment
Keep the sore clean and do not squeeze or pick it. Wash your hands before touching your eyes, genitalia, or another person. You can infect another person even if you have no visible sores. Avoid sharing eating utensils or drinking cups. Apply an over-the-counter cold-sore medication. In some cases your dentist may prescribe an anti-viral medication (such as acyclovir).