Hi....
First be sure to practice good hygiene. Meaning replace your razors, making sure your guys hands are clean (less bacteria the better), & wash with water (no soap) down there. The area that you're experiencing itching is more than likely a build up of bacteria. Stay clean!
Maybe I'm different but anytime there is a slight change in my body I run to the doctor. Go to the doctor to make sure its nothing serious
If there is any kinda of blood or burning I would see a dr. It could be some kinda of bacteria infection and they normally won't go away on there own and you don't want it to get any worse.