Small Red Patches on Penis foreskin (Photos)

It appeared a few weeks ago. First a small red patch. I ignored it as I thought I might have scratched it by mistake. But now it has spread to other parts. There is no itching or pain. I haven't had sex with anyone till date. I masturbate from time to time. When I wash it off the white spots disappear and only the patches look extra red and thicker than Penis foreskin. What should I do?

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