<s>[INST] I have a mark on the top side of my penis, towards the base, that started as some irritation when i tried trimming some hair, but now looks barely darker and is slightly indented. It doesn't hurt at all, but i have had unprotected sex and havent been tested, should i be worried? [/INST] Dear, We understand your concernsI went through your details. The mark you are talking about could be a bruise came out of your trimming. Over and above it do not have any pain, itching or burning. Therefore do not worry about it as STD. It will go off in a matter of days.If you require more of my help in this aspect, please use this URL.  Make sure that you include every minute detail possible. Hope this answers your query.  Further clarifications are welcome.Good luck. Take care. </s>