Conversation: The conversation between human and AI assistant.
[|Human|] i am 18 and have just found a purple spot on head of my penis,i noticed it straight after sexual intercourse,which was really only oral but did penetrate the vagina unprotected,a women also grabbed at my penis quite hard could this cause damage?i have read online an it seems it is not a sign of a std,but it does say it could be a burst blood vessel am not sure what to do..should i be worried?
[|AI|]  Hello welcome to Ask A Doctor service. I have reviewed your query and here is my advice. The purple spot is seeming to be because of traumatic injury to penis head. Vigorous sex sometime can lead such problem. Ice application can be done and non steroid anti-inflammatory Chat Doctor.  You can post photo to comment further. In STD there is presence of ulcer like lesion. Hope I have answered your question. Let me know if I can assist you further.