Zaid Alsalami, Shaykh Dr Zaid Alsalami is an Iraqi born scholar, raised in Australia. He obtained a BA from Al-Mustafa University, Qom, and an MA from the Islamic College in London. He also obtained a PhD from... Answered 1 month ago

Bismihi ta'ala

There are seven of our body parts that need to be fixed on the ground when we do sujud in our wajib prayers. 

Tip of our two toes of our two feet.
Our two knees.
Our two palms. 
Our forehead. 

The eighth, which is our nose is mustahab, to be placed on something that we can do sajdah on, like a turbah. 

In the case of your nose being raised from the ground, or on the ground, but on something that is not valid to do sajdah on, then there is no problem and the prayer will be valid. 

And Allah knows best.