<s>[INST] on monday i took a shower, a little after i noticed my penis felt a little itchy on the tip and a vein on my penis flarred up and i started to think maybe because it was because soap had entered the penis. But then a week prior to that, i had un protected sex for the first time so became worried. I reached out to my partner, she told me that she was clean so im still worried. [/INST] Thanks for asking in healthcaremagic forum   Dilated veins are due to increased blood flow which is common during erection. SO, you need not worry. Soap could have irritated your skin causing itching. If you have doubts go for STD check up with a doctor. All the best. </s>