Itching on both sides of the nose clinically is mainly seen in the following two causes: the first cause, seborrheic dermatitis, this disease is mainly prevalent in patients who often eat greasy, work faster rhythm, often stay up late, fire, endocrine disorders, clinically may be mainly related to the patient’s genetic factors, or microbial hosting such as mite infection in the nose, and dietary habits. This disease may be somewhat related to the patient’s age and gender. Some patients, such as those with higher androgen levels, resulting in more sebaceous secretion, are also prone to this condition, and some patients, such as those with dry neurological diseases such as Parkinson’s disease, are also prone to this condition. The second reason, allergic changes on both sides of the nose, may be that the patient ate allergic food, or the patient’s nose is coated with allergy-prone cosmetics, contact with dust mites and other microorganisms in the air, inducing allergic performance on both sides of the nose, and the application of anti-allergic ointment outside the nose will have a significant effect.