Thank you for your consult at DoctorSpring.com. I understand your concerns.
It is appreciable that you have very good awareness regarding HSV and its symptoms. But, practically sores can be due to a thousand reasons and would be preposterous of me to give my opinion without seeking more details regarding the sore. It would be of great help if you can provide me a photograph of the 'cold sore' that you have been referring to.
Awaiting your follow-up.
Dr. Saptharishi L G
MBBS, MD (Pediatrics), PGDCRL