Red penis

ashbash4 • Mommy to Carl and Cora; LOVE THE LIFE YOU LIVE; fuck what anyone says
My sons little manhood is a little red on one side near the tip. I gently pushed on it to see if he cried or anything and he didn't. It doesn't look like a rash or anything, just red. 
Could this be irraitaion from a diaper or ??