During this time you are capable of transmitting the virus to another person. In the majority of cases, within a matter of hours following prodromal symptoms, blisters will develop. Other accompanying symptoms may include low-grade fever, headache, generalized muscle aching, and tender swollen lymph nodes in the groin. Lesions can also show up other than the typical locations. Many patients who develop recurrent infections go into extended periods of chronic, repeated episodes for months and years.
Reasons why are only speculative at best.
Herpes acts like a electrical switch. At what point does our bodily environment trip the switch. For most people, herpes seems to come from no where. Yet, something is a catalyst to trip the switch. For Herpes I, exposure to sunlight can trip the switch, as in going to the beach.