What are the effects if herpes was left untreated?

Untreated Herpes: Untreated herpes can certainly cause discomfort and aggravation, but there are more significant dangers to consider. People with a weakened immune system may experience harsh outbreaks and develop complications. Left untreated, herpes increases a person's risk of getting the human immunodeficiency virus (hiv). Although rare, herpes can lead to a serious illness such as encephalitis or meningitis.