The initial infection may cause no symptoms or mouth ulcers . The virus remains in the nerve tissue of the face. In some people, the virus reactivates and produces recurrent cold sores that are usually in the same area but are not serious. Herpes virus type 2 causes genital herpes and infection of babies at birth. Both viruses are contagious.
Contact can occur directly, or through contact with infected razors, towels, dishes, etc.
The herpes virus can also infect the fetus and cause congenital abnormalities. The first symptoms usually appear 1 or 2 weeks after contact with an infected person, or up to as late as 20 or more days after exposure. The lesions of herpes labialis usually last for 7 to 10 days, then begin to resolve. The virus may become latent, residing in the nerve cells, with recurrence at or near the original site. Recurrence is usually milder.