tiny little cuts?

so i had sex yesterday and experienced a little pain afterwards. not unusual for me. however today this evening I peed and it stung, so i wiped,and saw a few little small dots of,blood, so i know it stung bc it got in those little,cuts on the skin between my vagina and rectum. any clue where these came from? ive had them before on my labia but Idk what they are from