My husband has sores on his back and. arms that get puffy red and pus build up he works in extream weather hot. conditions please tell me what this is?

Depends: I recommend a broad-spectrum sunscreen offering protection against both uva and uvb rays. Usually, at least three active ingredients are called for. These generally include paba derivatives, salicylates, and/or cinnamates for uvb absorption; benzophenones for shorter-wavelength uva protection; and avobenzone, ecamsule, and titanium dioxide, or zinc oxide for the remaining uva spectrum. Cover arms.