Hi, and thanks for your question
It sounds like you got a very thorough set of testing done. With negative results at 1 and 3 months, you can be reassured that the tests are accurate as the window periods for any infection have passed. The window period is the time between when a person comes in contact with a sexually transmitted infection (STI) and when the STI will show up on a test.
We often forget that the skin on our genitals is just like the skin on the rest of our bodies and there are any number of things besides STI’s that can cause irritation and rashes. Just because it’s on the genitals doesn’t mean it’s automatically an STI!
Things like dehydration, alcohol, nicotine and soaps/detergents can causes irritation to the urethra which can result in a discomfort when urinating. Soaps and detergents can also cause irritation or rash on the skin of the scrotum.
That being said, if these symptoms have been there for a couple of months and are not resolving, then I would recommend visiting a walk-in clinic or family doctor for a full assessment. You really don’t need to go to a sexual health clinic, as they will likely repeat the tests which you’ve already had. It would be worth having a physician assess. Without knowing which area you’re in I can’t really recommend a specific clinic. However, you should be able to find a walk-in clinic near you with a quick internet search.
Let us know if this does not answer your question or if you have any more questions or concerns.