Why Do I Have A Rash On My Penis, Itching On My Scrotum And Thighs, And A Burning Sensation When Urinating?

Hi Doctor I have small rash on my penis and when I urinate I feel itching inside my penis and also on my scrotum next to my thighs I feel itchy and when I scratch I feel like I can scratch all day and sometimes I peel the skin. Also inside my bladder Is very hot