I don’t know if i have an Std, uti, or just an infection.

Hey guys i woke up on Saturday with pain on my Penis. The pain is only on the tip and its burning/inflammation pain. It doesn't hurt to urinate or ejaculate. Took Azo late on Sunday night but I don't think its a uti. The only physical changes I've spotted myself are bumps (white and red) around the rim of my penis, urethra opening is a little red, and my frenelum (string part) is really red. What do yall think?

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When is the last time you had sexual contact? Does the pain increase when you penis becomes erect?