Be very careful if it comes out in your mouth, you are infected | April 25, 2025

Cold sores, also known as fever blisters, are a common viral infection primarily caused by the herpes simplex virus type 1 (HSV-1). In some cases, herpes simplex virus type 2 (HSV-2)—usually associated with genital herpes—can also lead to cold sores, especially through oral-genital contact.

What Causes Cold Sores?
Cold sores are highly contagious and spread easily from person to person, most often through contact with infected saliva or skin. Common ways the virus is transmitted include:

Direct contact: Kissing or sharing drinks, food, or utensils with an infected person.

Indirect contact: Using items contaminated with the virus, like towels, lip balm, or cutlery.

Self-infection (Autoinoculation): Touching a cold sore and then touching other parts of the body, such as the eyes or genitals, can spread the virus.

Recognizing the Symptoms
Cold sores tend to follow a series of stages:
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