my testes become redish and itchy but now i m using efficascent oil now no more itchy but still red

my testes become redish and itchy but now i m using efficascent oil now no more itchy but still redish it started around 2 mnths back.it started first n itchy bt no have redish,so i used cream for anti fungal cream but did not work.i felt these itchy after my gym so i thought coz of sweat and my supporter also was tight and instead of using brief i changed to boxer short. im having sex with my girlfriend but she dont have a problem for last six months..but i don't know with the other girl i got for one night stand..but i never forget to used pre caution...please help me! ! !i need your help badly...thank you..and god bless you...