Welcome and thanks for posting your query on HCM.
AS per your query you had herpes
genitalis 2 years back and now you have large sore which is getting bigger.
The important thing to tell you is such a large sore is never a presentation of herpes. Herpes generally manifest as small vesicles which remains for a day or two and then forms small erosions type of ulcers which heals in 4-5 days. As your sore is larger than small vesicles so possibility of herpes is unlikely.
Kinldy visit a dermatologist
specialized in sexually transmitted disease
for exact diagnosis.
Hope these informations are helpful.
Wish you good health,
Dr Sanjay Kumar Kanodia
(MD- Dermatology & STD