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.
1 HSV-1. 2  This is the type that usually causes cold sores or fever blisters around your mouth, though it can be spread to your genital area during oral sex. 3  Recurrences are much less frequent than they are with HSV-2 infection. 4  HSV-2.
Viral Sexually Transmitted Infections. 1  Herpes is caused by the herpes simplex virus. 2  Human Papilloma Virus (HPV), also known as the genital wart virus, can be treated with lotions and liquid nitrogen to freeze the warts. 3  Hepatitis B is caused by the Hepatitis B virus.