White puss coming out of your nose piercing what does that mean?

Well it simply means the piercing is healing, that's lymphatic matter. You body generates this as it builds new tissue. So as the healing progresses this discharge will ease off. Just simply irrigate the piercing under running water in the shower and shuffle or rotate the jewellery while rinsing the piercing. There is no need nor should you even use alcohol, hydrogen peroxide, bactine or any other solution on your piercing. That's it, nothing more.