purple /black shinny lump. what could it be ?

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I am a 27 years old male.

I have had the same partner for 2 months (100% faithful) my previous sexual encounter was close to 5-6 months ago and that was unprotected sex. We started and decided to stop it a few minutes into it since we didn't have protection.  The girl assured me she was safe and i took her word for it which i now regret.  We had extremely brief anal and vaginal sex.

I have had a heart surgery some time ago and that unprotected sexual partner was the first partner since the surgery. I assume i have been tested before the surgery for all possible type of STD’s since it would put me at great risk if i wasn't  

2 days i go i noticed a hard painful lump/ pimple like growth on the bottom of my shaft. The growth as since turn color and reduced size a little bit. It is i’d say 1-2 mm wide and thick. it now has a purple /black like shinny look on top of it it. It is also a bit soar beside it.

I have no clue what it could be but i’m scared. I have had a similar growth twice (in about 12 years before but on top of my pubic area.  It freaked me out at first but i figured it was a pimple. This on the penis shaft really freaks me out.

I have looked at a buch of pictures online to try to see things that might resemble but nothing.

Please help.

Thanks

[Vance2335]

yes even being painful. it could be HPV, syphilis, herpes, staph, irritation, fungial, bacterial...the list is almost endless. that is why it is best to see a Dr.

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even if the bump is painful ?

[Vance2335]

See a Dr. Bumps can be many things and often not STD related.