Whitish rough mud type spots on penis? ?

Today when I woke up there was some rough whitish or greyish mud type mud on my penis not on the cap but a little lower on the upper side. So when I scratched it. It started to removed in powder like form. Like mud. Then I washed it and it is clear now but skin there is a little rough not soft like my rest of the skin of penis is. I know you can understand what I'm talking about cuz I don't know what it called. Please tell me what is this.. 

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