Noticed these cuts/lesions/sores on vagina 3 days ago. What is it?

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on sunday last week (over a week ago now) i had sex for the first time in quite a few weeks, it was pretty rough & i was not properly lubricated like i should have been. the very same day i noticed the lips & entrance to my vagina was extremely irritated & painful. this has happened before and it almost made like little cuts around my vagina. it was irritated/painful for a few days but then seemed to almost completely go away until friday i noticed it started getting irritated again. fast forward to today... its not extremely irritated & hurts to touch. im also having an increased amount of discharge that is very "watery" - not sure if this pertains to it. i was able to get some pictures today& this is what it looks like. any idea? im in a strictly monogamous relationship & have had the same sex partner for 2 years. tested regularly & my results came back negative for everything back in may.