this occured a week ago. now, a a week later, it seems like the underside of my penis head is darker than the rest. i am very worried as it is kind of sore. do symptoms come this fast? what should i do? what should i look out for? i dont know who else to turn to. im sooo scared. thanks my friend mentioned it might be a hickey but i'm not sure about hickeys from oral sex. i know there's a lot of information out there but my heart and head are just too numb to think right now. sorry for the inconvenience i know i have this under vaginarium but i expect a loto f smart ass replies there.