Redness on the nose is clinically known as capillary dilatation, and the etiology is related to genetic, environmental, physical, and medication factors. Capillary dilatation is commonly known as red blood, patients usually have no obvious symptoms, but long-term presence will affect aesthetics. The pathogenesis of capillary dilatation is complex and no exact cause has been found. However, according to research findings, some patients with capillary dilatation have a family history of the disease, thus suggesting that there is a certain relationship with heredity. Secondly, capillary dilatation is also easily induced if one lives in a highland environment for a long period of time and is exposed to wind and sunlight. Prolonged temperature changes, such as cold and hot stimulation, will lead to capillary tolerance exceeding the normal range, thus inducing the disease. In addition, long-term use of steroid hormones or estrogenic drugs can also induce capillary dilatation. Redness on the nose is mostly considered to be capillary dilatation, and it is recommended that patients seek medical examination, and after diagnosis, if they feel that it affects their aesthetics, they can choose the appropriate way to remove it.