Why would the tip of my nose swell just out the blue? Its so swollen it hurt to touch. Sometimes with redness and other times its not.

Painful Swollen Nose. You may have an infection. Best to see you doctor about this. You may need an antibiotic.
Folliculitis. Infection of the hair follicles on the inside of your nose. Usually from manipulating the nose hair. Can lead to a serious infection of the face and even spread to the brain. Treated with antibiotics and antibiotic ointment in the nose.
See physician. Pain may be secondary to a superficial infection of the skin and tissue at the tip of the nose. It may also be a manifestation of relapsing polychondritis, which can cause recurring pain in the nose ears or other cartilage structures.