When you keep getting pimples on your nose it's usually because of too much sebum.
Too much sebum can trap dead skin and bacteria in the pores of your nose and other parts of your skin and cause pimples.
To stop pimples on your nose you can cleanse your nose using some facial cleanser that is made for pimples and also apply some apple cider vinegar or lemon juice to the nose pimples to help get rid of them.
Skin Toner also works great for removing excess dirt and oil from your nose skin which can help keep pimples away from your nose.
Most people cleanse their face often enough but some people forget to cleanse their nose skin which also has pores.
So you can break out with pimples on your nose skin because those pores can be clogged.