Mouth blisters or sores are small, red cuts or ulcers that appear on the insides of the lips, on gums or under the tongue. The sores, which may have white patches in the middle, are painful and take two to four weeks to ... More » Health Conditions & Diseases Skin Conditions

There can be many causes for mouth blisters or sores, including different types of infections, a burn or injury, braces or dentures that do not fit properly, stress, mouth cancer and some medical conditions, according to... More » Health Diagnostics & Imaging

Fever blisters that occur on and around the lips are caused by the herpes simplex virus, according to WebMD. There are two types of the herpes simplex virus that can cause sores on the mouth and genitals: HSV-1 and HSV-2... More » Health Pain & Symptoms

Canker sores are small, shallow lesions that develop on the gums, tongue and other soft tissues of the mouth, according to Mayo Clinic. Canker sores are not contagious and usually go away in a week or two. They can be pa... More » Health Conditions & Diseases Skin Conditions

Infantigo rash, known by the medical term impetigo, is a highly contagious bacterial skin infection characterized by fluid-filled, crusty sores and blisters, typically occurring around the nose, mouth and face, according... More » Health Conditions & Diseases Skin Conditions

Cold sores form on lips because of an infection by the herpes simplex virus, which gets into the body through a cut or scratch in the mouth or nearby skin, WebMD states. Contact with a cold sore or with HSV-infected flui... More »

Canker sores are painful sores that appear anywhere on inside the mouth such as the inside of the cheeks, the tongue and the soft palate. Also known as aphthous stomatitis, canker sores may appear as small ulcerations me... More »