What is this rash on my penis?

i recently felt itchiness on my penis but it felt as it was from the tip of the head but i pulled down my foreskin and saw this rash looking thing. Is it a STD? or? i had protected sex and received head in october and i went to get tested in january for every std and everything came out negative i don’t think it could be a STD. but its scary and i would like to know what it is i have an appointment to see a doctor this week.

i dont feel any pain when i pee or any burning sensation or no weird discharge everything normal other than the itchy rash