Herpetic whitlow is caused by infection with the herpes simplex virus (HSV). Infections with HSV are very contagious and are easily spread by direct contact with infected skin lesions.

How long is herpetic whitlow contagious?

While these vesicles are present, herpetic whitlow is extremely contagious. About 2 weeks after vesicles first appear, a crust forms over them. This signals the end of viral shedding. If untreated, the infection usually resolves in 3 to 4 weeks.

How did I get herpetic whitlow?

Herpetic whitlow is caused by a virus called herpes simplex. You can get it if you touch a cold sore or blister of another infected person. You're more likely to get herpetic whitlow if you've had cold sores or genital herpes.