Penis infection or red rash on glan.

I am suffering some sort of infection either it is bacterial or fungus on  my penis under foreskin.i am not circumcised .I never faced such prob in life.when I faced such problem simultaneously I got rashes on my arms and theighs.which itches.after getting off from my job I came back home one month back.i started taking vitamin d sachets. As from past 6 months I never took sunlight.rashes gone.but the infection on my penis come back after having sex.embedded red nervees visible on my penis glan.i used extravrigin coconut oil Castrol oil. But still it's not cured.i got itching on my testis and penis foreskin tip.but after applying candid b it's gone.but there is a little pain or rash under foreskin.i consulted a sexologist.he told me pearly penile.but what about the other symtoms.si it balanitis or other thing .whenever I do sex my penis become glan become red and remain swelled needs advice