Cold Sore

dnp

Also known as fever blisters, cold sores are localized collections of clear fluid causing elevation of the skin, separating it into an upper and lower layer, often recurring about once per year. Generally due to Herpes Type 1 (HSV1) and appearing as blisters on the outside surface of the lips but also on the face and inside the mouth, eventually breaking down to form small ulcers and finally scabs.