Help. Something odd with his penis.

I've noticed my little guy has been grooming/biting around the genital area a lot more so after giving it a check I didn't see any hair rings but I noticed it was sticking out more and also looks swollen. Also the coloration seems very dark (I just recently returned from university so while I was gone I wasn't the main caretaker so I'm concerned something happened while I was away). Overall his actions and activities seem normal and playful. He's eating/drinking fine and pooping just as...

Help. Something odd with his penis.