Please post your message in Dermatologist community where you will get right answers. Generally first you try any bacterial ointment. If there is not effect for 3 or 4 days go to dermatologist. If it is after sexual acticity, it may be sexually tranferred disease (STD) then you will post your message in STD forum.
I have received your invitation for friendship. I have already accepted it thanks for the invitation. Sorry could not help you much in your current problem.