I don't know but I have a small one and can having a deasie stop the growth of it
you should porbably learn more about sex before you have it no a disease cant stop your penis growing but it can make it look and feel horrible some diseases can also kill you see a doctor to get tested to find out if you have a disease as for why it tastes spicey, its most likley due to the things in your diet (what your eating)
whatever you eat makes your cum taste like that if you are really worried go see your doctor