Herpes Simplex: Good day; Cold sores cause millimeter, fluid-filled lesions also known as fever blisters to occur periodically. In youngsters they may be caused by stress; in adults they may be passed from person to person by kissing or sex. Cold Sore triggers include stress, fatigue, cold weather, dental trauma and weakened immune condition. Medications improve comfort but don't cure cold sores.
Answered 3/22/2020
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