Spider nose veins are often caused by conditions like rosacea or rhinophyma. Rosacea is a chronic, acne-like condition that causes redness, bumps, and spider veins. It begins with a subtle flushing of the nose, cheeks, chin, or forehead, but can worsen over time if left untreated. Untreated rosacea can cause rhinophyma, an enlargement of tissue. This creates a bulbous, ruddy appearance, particularly in the nose.