My Husband Is 38 Yrs Old, Truck Driver And Was

My husband is 38 yrs old, truck driver and was home on vacation 2 weeks ago. When he arrived he had 2 spots on his back - like a rash. I met up with him today and his whole body is loaded with a rash. Now, 10 days ago he was working in the garden, pulling out some plants...rosemary, sage, basil. He has not had a fever. He is from El Salvador so he doesn't remember if he had chicken pox, rubella, or German measles. His rash looks like hives, no blisters as in chicken pox. In the truck he lays on a mattress but has been for the last year. Please help him.