Why is my husbands penis itch, he has like a rash kinda looks like some tiny blisters at the tip, well around the head of the penis, what could it be.?

Pearly penile papule. Pearly penile papules are tiny bumps that ring the rim of the penis head. They are typically flesh-colored or a little lighter and have a smooth dome shape. Interestingly, they also seem to form in organized rows, like a string of pearls. There are no harmful effects other than some possible sensitivity that may be uncomfortable during sex or other activities.