 [ Symptoms ] i have pain and limited movement along right body side [ Disease ] prostatitis should not cause rednesssoreness at the tip of the penis so you are correct there is likely another cause unfortunately it would not be possible to determine a specific cause blindly over the internet based solely on your very brief description you will need to see your medical provider again not just because of this rednesssoreness but because you apparently have not responded to three weeks of antibiotics for your prostatitis you may want to consider seeing a urologist it is probably just some ordinary skin irritation try using a penis health creme called man1 man oil it specializes in penis skin issues like this and will get things back to normal quickly and safely it was a good move to get an std test you can rule that stuff out try the creme