Re: A ? for mamas with intact sons
My ds also has very sensitive skin, and he sometimes gets red on the tip of the foreskin. He just potty trained, and it stopped happening after he stopped wearing diapers. He does wear a dipe at night, and wakes up with the redness sometimes. So I think it's just bacteria from the urine being against the skin.
You may just need to change him more often, like every time he pees. See if that clears it up.