If the apparent visual magnitude of the Sun is -26.5 and that of the full moon is -12.5, what is the light intensity ratio of sunlight to moonlight received at Earth on the day of the full moon?
Symptoms of a cold sore can include: 1  a tingling sensation, redness and swelling around the lip before the cold sore develops. 2  small, fluid-filled blisters which break open and develop a yellow crust (scab). The scab usually falls off around seven days later.
Cold sores are tiny blisters that develop on the lips or around the mouth. Cold sores are caused by the herpes simplex virus strain HSV-1. On rare occasions cold sores may be caused by strain HSV-2 - a result of having oral sex with someone who has genital herpes.