20 year old male, found a purple mark on penis.

Patient : I found a purple mark on my penis, a month has passed and it has not showed any signs of disappearing. It is not painful, there has been no discharge and it does not itch at all. Here is a picture if it will help: http://imgur.com/kvBiZVW After reading online trying to find an answer, i have started worrying it may be something serious. I am not sexually active presently other than oral sex 3 months ago (It was oral sex both ways with a woman) - I wore a condom, although she was not using any protection.
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