Have A Relative That Broke Out In Rash, Bumps, And

Have a relative that broke out in rash, bumps, and pimples that when broken have clear liquid and an uncontrollable itch. Was diagnosed first as scabbies, then phoriasis, then secondary infection, and now allergies. The rash is spreading and is worse around his genitals and butt. It appears all over his body. Believe it is contagious because 7 people have the same symptons in his area that he works. He was given scabbie medicine, antibodics, cream and claridin and nothing is helping.