Redness on the underside of & left testicle as well as slight itch. Fever & major headache, any help?

My husband developed a redness on his and testicle has a fever even after taking a fever reducer and has a horrible headache. It just developed overnight and he is in the Navy and isn't about to see a Navy doctor for this if he can help it. No he doesn't have an STD, no it is completely impossible for him to have one so don't even say anything about that one. I wasn't really concerned with the rash until the fever and headache developed so any help would be greatly appreciated.