What Are Cold Sore Triggers?: Cold sores on the lip or mouth are caused by the herpes simplex virus type 1 (HSV-1) or genital herpes, which can be contagious when a person is experiencing symptoms or not. Triggers for cold sores may include stress, recent fever, illness, fatigue, hormonal changes, sunlight, exposure to wind, cold weather, and more.

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Eye Herpes

Eye herpes (herpes simplex keratitis) is an eye infection caused by the herpes simplex virus. Symptoms and signs include redness, pain, blurred vision, tearing, and photophobia. Treatment may involve and antiviral eyedrop such as trifluridine or an antiviral oral medication such as acyclovir.