Redness on the nose can be caused by rosacea, worm infection, hormone-dependent dermatitis, and so on. 1. Rosacea: The main symptoms are paroxysmal flushing in the middle of the face, persistent erythema or papules, and dilated capillaries centered on a “red nose”. 2. Worm infection: The nose is infected by follicular worms, which leads to inflammation of the nose, and then leads to capillary dilatation of the nose. 3. Hormone-dependent dermatitis: if the nose long-term use of topical dexamethasone and other glucocorticoid ointment, over time will also cause local capillary dilation, manifested as red blood. It is recommended that people with redness on the nose go to a regular hospital in a timely manner to clarify the cause of the disease and standardize the treatment under the guidance of the doctor.