HSV-2 is a types of herpes virus that causes painful blisters on the genitals or any other part of the body that the virus first came in contact with. This is a highly contagious virus and the symptoms for genital herpes can show up between 2-12 days of being exposed to the virus.
Sources:
https://www.mayoclinic.org/diseases-conditions/genital-herpes/symptoms-causes/syc-20356161
https://www.cdc.gov/std/herpes/stdfact-herpes.htm
https://my.clevelandclinic.org/health/diseases/4248-genital-herpes-hsv-2
https://www.healthline.com/health/std/genital-herpes#when-to-see-a-doctor