causes of a sore mouth
cold sores are caused by the herpes simplex viruses the most common cause of sores around the mouth is herpes simplex type 1 or hsv 1 much less commonly cold sores may be caused by hsv 2 herpes simplex type 2 which may result from having oral sex with a person who has genital herpes canker sore is a small ulcer crater in the lining of the mouth it is frequently painful canker sores are also known as aphthous ulcers canker sores occur in the soft tissue of the mouth where cold sores do not appear cold sores are quite common
you may have a mouth ulcer if you have a painful sore or sores inside your mouth on the tongue soft palate the back portion of the roof of your mouth or inside your cheekssores in your mouth that are round white or grey in colour with a red edge or borderou may have a mouth ulcer if you have a painful sore or sores inside your mouth on the tongue soft palate the back portion of the roof of your mouth or inside your cheeks