right in front of one's nose; right next to you
Used for something physically very close, often with a nuance of being so close it's almost touching or obvious.
The answer was right under my nose, but I didn't notice.
He blew cigarette smoke right in front of my nose.
tip of one's nose
Literal body part meaning; less common than the idiomatic sense.
The tip of my nose turned red from the cold.
Compound of 鼻 (nose) + の (possessive particle) + 先 (tip, front). Literally 'the tip of the nose' or 'in front of the nose'.