An itchy nose can be caused by allergic rhinitis, rosacea, hormone-dependent dermatitis, or other diseases. 1. Allergic rhinitis: Influenced by genetics, environment and microbial flora, the body produces an over-excited immune response, which can cause chronic inflammation. Patients may experience nasal itching, paroxysmal sneezing, runny nose, nasal congestion and other manifestations within minutes after inhaling allergens. 2. Rosacea: rosacea, also known as rosacea, has an unclear pathogenesis and is considered to be related to a combination of factors. Rosacea is a chronic inflammatory disease, the main symptom is red nose, mainly manifested as paroxysmal flushing in the middle of the face, capillary dilatation, may be accompanied by tingling or itching and other symptoms. 3. Hormone-dependent dermatitis: long-term use of glucocorticoid topical drugs, resulting in local skin inflammatory reaction, is a hormone-dependent dermatitis, which may lead to itching of the tip of the nose. Some patients will be accompanied by nasal erythema, small papules and other symptoms. In addition to this, it is also important to understand whether it is related to colds, eczema, folliculitis and other factors, caused by the tip of the nose itching. It is recommended to go to the dermatology department of the hospital in a timely manner to find the cause of the local itching, and then treat the cause under the guidance of the doctor.