He may have more than one STD.
Thick, cloudy, foul-smelling penile discharge accompanied with painful, burning sensation upon urination, are symptoms of STD, like gonorrhea.
Small red bumps located at the penile head and around the foreskin, that develop into blisters, and then become painful open sores, with itching or burning feeling in the genital or anal area, are symptoms suggestive for genital herpes.

Is best for him to get tested and treated at the sexual clinic as soon as possible.