I am having some browny coloured discharge from penis, burn when. Urinating, urine dark coloured and head of penis sore. What is this?

Be evaluated soon... Your described symptoms need a timely check up so to assure if you have STD-related urethritis or UTI, but the reported profile is insufficient t deduce right diagnosis for right treatment. To do this right, follow suggestion in http://formefirst.com/eNewsletter06.html and in http://formefirst.com/onUTI.html. Thereby you can surely work well with doctor for right care you deserve. Best...
Agree w Dr. Lin. You need prompt evaluation for infection. The actual diagnosis will determine the treatment plan.