Excess oil on the nose can be caused by a variety of factors, including genetics, hormones, and diet. Additionally, it is important to note that oily skin can be caused by using skin care products that are too heavy or not formulated for oily skin. To reduce oiliness on the nose, it is important to use oil free skin care products and to avoid over washing the face. Additionally, it is important to keep the skin hydrated with a lightweight, oil free moisturizer.