The Difference Between Cold Sores & Canker Sores

Only One Is Contagious

Cold sores and canker sores may seem similar, but remember only one is contagious. Cold sores are caused by a viral infection known as herpes simplex virus (HSV), which is quite contagious and affects about fifty percent of kids going into kindergarten and up to ninety percent of adults, although only a small share actually experience symptoms. HSV can be spread to others through contact with the blister until the sore completely heals.

Because most individuals who have the herpes simplex virus also shed the virus, they can be infectious even when there are no sores. Patients may shed HSV cells from the site where a cold sore has occurred even when there are no symptoms, although they do not shed cells all the time. It's possible to spread the herpes simplex virus by kissing or sharing utensils, towels, or razors.

Get familiar with the differences in the appearance of the sores next.