Question: are all fever blisters a form of herpes?
Answer: Cold Sores / Fever Blisters. Cold sores, also known as fever blisters or oral herpes, appear on the lips, on the gums, or in the mouth. Cold sores are highly contagious and very common. Oral herpes (cold sores, fever blisters) and genital herpes are both caused by viruses in the herpes family.