Dark circles under the eyes are also called “allergicshiners”. The common cause of dark circles under the eyes is nasal congestion, and the most common cause of long-term nasal congestion is allergic rhinitis. Nasal congestion causes increased resistance to blood circulation around the nose, causing blood to flow and congestion in the face, and capillary congestion around the eyes, thus causing dark circles under the eyes. When fluid is retained in the blood vessels, it flows into the tissues and causes swelling of the lower eyelids. Dark circles under the eyes can become more pronounced with exposure to allergens, and some children have dark circles only seasonally, while others have them all year round. A common allergen is the one that causes allergic rhinitis. Outdoor allergens are more often considered for seasonal aggravation, and indoor allergens are more often considered for those that are present all year round. To alleviate dark circles under the eyes you should pay attention to avoid allergen exposure. Most dark circles are not serious, but beware of several red flags: (1) Bleeding in the eye, called anterior chamber blood accumulation: this is a very serious condition that may affect vision and damage the cornea. In the case of anterior chamber hemorrhage, you will see small blood-red circles at the junction of the child’s iris and the white of the eye. (2) Blood in the white of the eye means that the eye itself has suffered an impact: it is important to see a doctor to check for damage inside the eye. Seek immediate medical attention if your child has vision problems (double vision or blurred vision), severe pain, bleeding inside the eye, or a nosebleed. In addition, it is important to clean the nasal passages with sea salt water or saline to help relieve congestion and reduce dark circles under the eyes. Seek medical attention if nasal congestion or coughing becomes apparent. Depending on your baby’s condition, your doctor may prescribe hormonal nasal sprays and oral anti-allergy medication. Allergic rhinitis is a chronic disease that requires gradual treatment to adjust the treatment plan at different stages.