White marks on penis

A couple of weeks ago and just after sex, i noticed that the head of my penis had a dark red mark on it (almost like a bruise) Over the next day or so, the redness faded and left me with this white scaly type patch. It doesn't itch and it isn't sore but has been there for a couple of weeks. I have stopped using soap to wash it and just use warm clean water and pat dry, but nothing is cleaning it up. Can anyone help with what if might be?

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