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.
Hormonal changes in women may cause a cold sore to emerge, as well as fatigue, overexposure to sunlight and even food allergies. Irritation to the mouth, such as dental work, can also trigger a cold sore. Some of the conditions that are known cold sores triggers can be avoided.