These red spots appeared on my penis today and I don’t know what’s going on

These red spots appeared on the head of my penis today. I tested negative for every STD a month after possible exposure and I took a test again today. I don't know what to do and I'm terrified. it slightly burns right now and it burns a little when I urinate. if anyone can help please do.

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can you point out which spots you are refering to?
any update on your condition?