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.