As per the details u have submitted , it is herpes zoster
infection. ..so ur thinking In a wrong way that it is herpes simplex
. Herpes simplex is STD but not herpes zoster. Ok. Herpes zoster presents as unilateral itchy vesicular rash
confined to only one side and one dermatome due to reactivativation of pox virus , from nerve
roots. Commonly seen I when immunity decreases.
So don't worry about it , complete the course of anti viral drugs.
Hope this will help u