Just 1 intercourse with safe partner 7-8 days ago. That person have no symptoms of any kind. There is no pain unless i touch the ulcer, sometimes small itching feeling
Very much worth getting an immediate swab. Herpes is a possibility, although I'm not sure I see the more typical red base and blisters. I see more of an inflamed moist surface from a fungus or bacteria.
The sexual history leading into this is important, what activity have you had in the two weeks preceding the sore appearing?