Sometime people experience a certain kind of ulcers on their lips, mouths and face. The fires are small, red and painful nature. It can also take place on fingers, gums and palate. This type of disease is caused by Herpes Simplex Virus. It has two types – Type I & Type II. Virus Type I cause the Cold Sores
The virus enters the body and stays in the root of the central nervous system. It does not get activated soon but wait for long periods. When it awakes, it spread by growing inside the cells and killing the host cells thus producing an itching and burning sensation in the skin. From outside, it is visible as the cold sores.