What Causes White, Foamy Discharge From Penis?

Hello. I had noticed a white, foamy discharge from my penis last year. I promptly visited my on campus doctor. He told me that it was a fungus and gave me both a cream and a powder. I looked in the shower this morning and saw that it had returned. It's a white, patchy fungus. It caused no irritation until a day or two ago. Seeing as it didn't go away the first time, should I look into having a circumcision?