Given the information you provided (painful, itching burning in the penis and testicles that spreads down the legs), it seems likely that you might be experiencing a urogenital infection. This condition might be caused by bacteria or fungi. Which one has caused it cannot be determined without further examination. A complete blood count and urinalysis might be needed to confirm the presence of infection. In case of infection, WBC (white blood cells) might be elevated and bacteria and leucocytes might be found in the urine.
A urine culture might determine the exact bacteria or fungi that caused the condition and the most effective medication that would treat it.
If infection is not detected and there is no pus in the urine, you might want to visit a neurologist to check if the pain is related to a neurological issue affecting the nerves in the pelvis. Evoked potentials might be needed to detect a possible radicular lesion of the nerves responsible for the legs; certain of them might be supplying neurons for the genital area, too.
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