“Herpes is caused by sexual intimacy and contact with a person who is actively shedding the herpes virus,” says Cullins. If you have HSV-1, that shedding could happen through the mouth or a cold sore, which means that the virus can be transmitted through kissing, or just sharing a drink. If you have herpes that affects the genitals, it can be transmitted from sharing sex toys, grinding, or even mutual masturbation — any activity where the virus can be transmitted from one person to another through skin-to-skin or mucosal contact.

The causes of reactivation are uncertain, but several potential triggers have been documented. A 2009 study showed the protein VP16 plays a key role in reactivation of the dormant virus.[71] Changes in the immune system during menstruation may play a role in HSV-1 reactivation.[72][73] Concurrent infections, such as viral upper respiratory tract infection or other febrile diseases, can cause outbreaks. Reactivation due to other infections is the likely source of the historic terms 'cold sore' and 'fever blister'.

Avoid touching any sores you have. If you do, wash your hands with soap and water. You should avoid sex while you have sores, and use a male or female condom or dental dam with your partner if sex occurs despite intentions to not have sex. Herpes is most contagious during an outbreak, but it’s also possible to spread herpes when no symptoms are present.

Doctors prescribe suppressive treatment if a person experiences more than six recurrences in a year. In some cases, a doctor my recommend that the individual takes daily antiviral treatment indefinitely. The aim here is to prevent further recurrences. Although suppressive treatment significantly reduces the risk of passing HSV to a partner, there is still a risk.

"When you are having an outbreak of oral herpes, symptoms usually start with a burning, itching or tingling sensation on your lips," Michael says. "This will intensify until a small rash, and then blisters, appear. These sores are commonly called 'cold sores'. The blisters are usually filled with a clear or slightly yellow liquid. Over a short time, these blisters will burst leaving a painful, raw area. These will then dry and scab over. The scabs will generally fall off after a week or two, leaving fresh clear skin beneath."
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