Thanks for your query at DoctorSpring.com
I can understand your concern.
From your history, it sounds like genital herpes from the way they look. But absence of pain or burning suggests that we may be dealing with something else. The tests being negative also may go against herpes.
Rarely, in spite of no symptoms and negative tests it could still be herpes. I would recommend seeing a picture of the lesion and then giving my opinion as to what it is.
Awaiting your reply.