How about herpes?

Herpes simplex virus infection, most of the cases belong to herpes simplex virus infection, the virus first through the respiratory tract invasion of the human body, to the root of the human ganglion, these special parts, and then in a latent state, catch up with the human body because of staying up late, angry, cold, illness, fatigue, resulting in decreased immunity, herpes virus along the nerve distribution area, to the skin surface, its symptoms, began to proliferate, Then the virus will cause local skin inflammation, destroy the structure of the skin, will form erythema, blisters, edema, stimulate nerve endings, patients will feel pain, even itching, burning feeling, then herpes simplex occurs.