Cold sores also called as fever blisters. This infection spreads because of the herpes simplex viruses. These viruses are contagious and infection catches the body soon. Occurrence of the viruses can be observed through the tingling of lips, small and hard spots around the area of mouth and fingers. Herpes simplex viruses enter the body through mouth and then attack the nerve cells. From the nerve cells, they move towards the ganglia there, that lay in dormant state. When the suitable condition occur viruses gets activate and shows the presence through blisters.
Symptoms of the viruses include painful, small and fluid filled blisters come on red, raised and panic area of the skin. Symptoms of blisters may comprise paining and tingling of the skin. Tingling and paining of the skin called as the prodromes and precedes the blisters by one or two days. Duration of the blisters is about seven to ten days. Areas where blisters come frequently are lips, nostrils, fingers and chin. In rare cases, they may occur inside the mouth on gums and hard palate. All these symptoms can be observed after about 20 days of attack and when out breaks last for about seven to ten days. Usually the blisters forms, breaks after some time and then leaks stick fluid. After this process, a yellow crust forms and finally sloughs off to uncover pinkish skin.
