Hello, My English Isn't Very Good But I Will Try

Hello,
my english isn't very good but i will try to ask my question. I am 20 years old.
Yestarday i feel itch on my penis.
Today I look on him and notice the colour of urethra (photo).
http://i.imgur.com/OIbDqYz.jpg
Should I worry?
I am scared about a cancer...