Penis problem

Patient: Hi, im 18 years old ..2 weeks ago I had my first sex with my gf..she said she was clear and was her first sex to…. After 2 weeks i got this small pimple like spots on my penis under the forskin… It is not itchy and no discharge and no pus… People said it is comon that happens on every man … I need an answer that can make my thnkings better