Salmon-Challis National Forest, Idaho. It is the second largest National Forest in the continental United States. In 1876, the US Congress created an office to evaluate the conditions of forests in the US. In 1891, President Theodore Roosevelt assigned the control of the newly named, national forests to the US Forest Service.
Cold sores are caused by certain strains of the herpes simplex virus (HSV). HSV-1 usually causes cold sores.
Causes and Triggers of Cold Sore. Cold sore, also called fever blister, is an infection of the lips, mouth, or gums due to the herpes simplex virus, also known as HSV-1. Direct sunlight exposure on lips may cause cold sore since there will be straight ultra violet rays that is harm to skins.