Cold sores are small, painful, and fluid-loaded eruptions or blisters, which typically crop on facial parts, such as mouth, lips, nostrils, jaw and cheek. They are also called herpes labialis, fever blisters, or oral herpes. Cold sores are also called herpes labialis, fever blisters, or oral herpes. They are tiny, painful, and fluid-loaded eruptions or even blisters, which typically crop standing on facial parts, such as mouth, lips, nostrils, jaw and cheek. You may experience a tingling sensati