Hi I Have A Male Friend Complaining Of Pain And

Hi i have a male friend complaining of pain and a rash in his genital region. He has recently has has unprotected sex with a back packer. Is there any chance you can give me a few names of what it could possibly be. I have asked him to go to the doctors but he is to embarrased . So i would like a few possibilites so i can google them n take him some information