Mouth ulcers or canker sores are superficial lesions that appear in the soft tissues of the mouth. They can be painful and cause problems when speaking and eating.
Treatment is usually symptomatic by applying protective gels, and most of them disappear on their own after a few days.
Cold sores are a viral infection caused by the HSV-1 virus. It is contagious by close contact and can be transmitted through oral sex.
Produces small fluid-filled blisters in the lip area. Symptoms can last for several days, and blisters may take up to 3 weeks to fully heal.
Once an episode of herpes infection has occurred, the virus remains inactive in nerve cells and can arise as another cold sore in the same place as before.