Herpes On Shaft I Have A BB Sized Blister On The Shaft Of My Penis. Is It Herpes?

I have a BB sized blister on the shaft of my penis. Is it herpes? - herpes on shaft

The thing is, it was almost 5 months since the last time you had sex and I used a condom. It is painful to the touch, but in no symptoms of herpes, such as burning or itching. Moreover, it is the first time I saw so little, and I heard that herpes is present within 12 days after infection. It's freakin me out. I would like to see a doctor, but I want to discover the people. Any help is greatly appreciated.