Redness inside the nostrils may be caused by nose picking, nasal vestibulitis, acute and chronic rhinitis and sinusitis. 1. Nose picking: If you often pick and dig your nostrils with your hands, it may lead to congestion of the nostrils due to traumatic stimulation, resulting in redness inside the nostrils. 2. Nasal vestibulitis: diffuse inflammation of the skin of the nasal vestibule. Especially in the acute stage, diffuse redness and swelling of the skin in the nasal vestibule and its junction with the upper lip, pain is obvious, forming the phenomenon of redness inside the nostrils. 3. Acute and chronic rhinitis sinusitis: inflammation of the nasal cavity and sinuses, resulting in congestion and swelling of the mucous membrane of the nasal cavity, the inferior turbinate is enlarged. The formation of the phenomenon of redness inside the nostrils. The redness of the nostrils of the patient, the symptoms are serious and accompanied by other uncomfortable symptoms, should go to the hospital in a timely manner, to identify the cause of the disease, under the guidance of a professional doctor to give targeted treatment.