White puss-like liquid comes out of face pores when squeezing face skin really hard, specially around tip of nose. I've oily skin.?

Dirt & Oil. Our pores get filled with dirt & oil daily. Our skin naturally produces oils to help protect it. When bacteria are involved it causes acne (pimples), which can lead to pus. Try to avoid squeezing your skin, it can cause redness & inflammation.
Oily skin. Fortunately this is not likely to be pus. This is likely excessive skin oils (called sebum). Gentle skin cleansers can help but the oiliness will likely re-accumulate over the day. If this really concerns you certainly have your doctor take a look.