Redness of the baby’s nostrils may be caused by acute nasal vestibulitis, nasal vestibular eczema, nasal vestibular boils and other causes. 1. Acute Nasal Vestibular Inflammation: As the baby’s nasal cavity is sensitive, frequent nose picking may stimulate diffuse congestion and edema of the nasal vestibular skin, thus causing redness of the baby’s nostrils. 2. Nasal vestibular eczema: Nasal vestibular eczema is a superficial seriousness of the skin, belongs to the metamorphosis of the disease, mainly snot impregnation or facial eczema spread. The main symptom is the redness of the baby’s nostrils and itching. 3. Nasal vestibular boils: Nasal vestibular boils are localized acute suppurative inflammation of the sebaceous glands and sweat glands in the nasal vestibule, which may be manifested by abscesses and congestion of the skin in the nasal vestibule, leading to redness in the baby’s nostrils. Parents should take their babies to regular hospitals for consultation when they find redness in their babies’ nostrils, so as to clarify the cause of the disease and carry out targeted treatment under the guidance of professional doctors.