What Causes White Spots, Purple Patches, And Redness On My Foreskin, Along With A Cheesy Smell And Some Stinging?

when i retract my foreskin, there is some white spots around and purple around the ring of my tip. on the foreskin i see a some purple blue-ish stuff patches on it and some red patches on the tip. it gave off a cheasy smell and ive tried washing it everyday, it has gone abit but still there. i can touch it abit but it still stings. under it the skin is joint up to my tip and i dont think its supposed to be like that. please help doctor