Red/Purple Spots on Penis Head and Around Corona

i had sex with my wife about 5 weeks ago, and a couple of days later i noticed on my penis head that there were some bright red spots randomally scattered around it. After a week they faded, but even now they are still visible but more of a purple looking colour than the original bright red. I have no discharge, no pain when peeing, just some mild discomfort in the area. Spoke to a GP over the phone who said that it didnt sound like an STD, but couldn't confirm anything without seeing in person. wondered if anyone had any ideas?

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Does it itch?