herpes febrilis

herpes simplex caused mainly by human herpesvirus 1 but also by human herpesvirus 2, and primarily spread by oral secretions; it usually occurs as a concomitant of fever, but may develop in the absence of fever or prior illness, and commonly involves the facial region, especially the vermilion border of the lips (h. labialis) and the nares; the vesicular lesions are self-limited. Called also cold sore and fever blister.