Redness, swelling and pain at the edge of the nostril can be considered to be related to nasal vestibular eczema, nasal vestibular inflammation and nasal vestibular boils. 1. Nasal vestibular eczema: often caused by acute rhinitis, allergic rhinitis and other diseases that lead to excessive nasal secretion, stimulate the skin of the nasal vestibule to appear eczema and itchy changes, and then secondary infections that cause redness, swelling and pain at the edge of the nostrils. 2. Inflammation of the nasal vestibule: Frequent digging of the nostrils, pulling out nose hairs and other factors can easily lead to bacterial infection, resulting in inflammation of the nasal vestibule, which will cause redness, swelling and pain at the edge of the nostrils. 3. Nasal vestibule boils: When the inflammation of the nasal vestibule is limited, it can gradually develop into nasal vestibule boils, resulting in localized redness, swelling, elevation and pain in the nasal vestibule. When the boil matures, it develops into a nasal vestibular abscess. If there is redness, swelling and pain at the edge of the nostril, it is recommended to actively go to the hospital for consultation and targeted treatment after clarifying the cause of the disease.