The Nose from Jupiter by Richard Scrimger

From chapters.ca:
What would you do if you had an opinionated extraterrestrial living in your nose? Alan Dingwall is sure to find out in The Nose from Jupiter. A typically shy 13- year- old, Alan’s life takes a turn when Norbert, an alien from Jupiter, moves into his nose. Things get even more interesting as Norbert helps Alan discover cosmic powers he may have had all along.