Thanks for writing to us.
Your description is most likely suggestive of folliculitis
which is infection of the hair follicle. If there is a white head on its top then it is indicative of infection which needs antibiotics for treatment.
The lesion you described is less likely to be due to STD
but there is no substitute of s direct examination for the proper diagnosis.
I hope this information has been both informative and helpful for you.
Dr. Praveen Tayal