self harm/ sh help/ stitches? *no pics just specific details*

TW! mentions of self harm specifics TW! Hi. I could really use some advice coming from people who deal with sh and deep cuts. generally i pay attention to what im doing enough, so ive never cut deep. never enough to have developed a keloid. but today i did not pay attention. i cant tell if i can see the surface of my fat, or i can see puss from the wound. but im pretty sure its the surface level of my fat. has this been the case for anyone? and has it healed fine without medical help? to be specific its about 1mm. im super scared its gonna become infected or i need some medical attention. im sure thats not the case. And im not looking for direct medical advice. i just need to hear its happened this way to someone else and it was okay, lol. also whats your approach for aftercare?