Definition of masked. 1  1 : marked by the use of masks a masked ball. 2  2 : failing to present or produce the usual symptoms : latent a masked infection a masked virus.
The herpes simplex virus (HSV) is a double-stranded DNA virus with an enveloped, icosahedral capsid. It is a common cause of infections of the skin and mucous membranes, manifesting itself as tiny, clear, fluid-filled blisters usually around the mouth or genitals.
Infection with the herpes simplex virus, commonly known as herpes, can be due to either herpes simplex virus 1 (HSV-1) or herpes simplex virus 2 (HSV-2). HSV-1 is mainly transmitted by oral to oral contact. HSV-2 is a sexually transmitted infection that can cause painful genital ulcer disease.