Sore on penis shaft

I have a sore on my penis shaft the size on a  pencil  eraser  That showed up a week or so ago and it turned into a crater like sore and it’s still not gone yet but seems to be healing, no really painful but I can tell it’s there. I need some help on what it could be. 

i guess it can be a HSV2, but you need to tell more information and go to see a doctor, youll be fine 

Not sure this is YOUR problem, but I've seen many instances where someone had chemicals or whatnot on their hands and went to the bathroom without washing their hands first. Can cause good burns/sores on the penis. Just a thought....

Should I go to a dermatologist or normal doctor? 

I had sex with this girl(unprotected) the next day I saw a small bump and 2 days later it turned into the eraser size crater with a clear fluid in it but nothing else and a week later I’m here where it’s still the same size but it’s closed up and just red with dry skin around the sore

urologist, but a normal doctor will work too, just get test and see what you should do, relax, it can be controlled