I have a little pimple or sore on my clit. is it a sign of herpes simplex?

It is more likely to be Herpes Type 2 (HSV-2) known as Genital Herpes and is more likely to be Sexually Transmitted. Herpes Simplex - (HSV-1) tends to occur around the mouth ( oral Herpes) and tend to occur with Stressor more often. There is treatment and management Practices for Herpes Infections, so a visit to the PCP /Infectious Disease Expert or Gynecologist will help.