Herpes is a group of virus that may cause agonizing sores and blisters. Herpes viruses are of a few kinds: Herpes simplex that causes blisters and chilly sores around the mouth; Herpes genital that causes the sores and blisters to look within the genitals and Finally, Herpes zoster that can result in shingles and chickenpox. The levels of Herpes may not often be very well defined and will not comply with a recognised program or path.