What Causes Soreness In Stomach And Bumps In Back And Legs?

Hi, I m really worried about my dad he is almost 60, quit smoking 6 months ago and has been getting sick frequently is stomach is hard, he comes out on his back and legs with really bad pimples, he woke up with a stye on his eye and a cold sore on his lip and his back is covered in bumps. He is stubborn won t go to the doctor.