The red color on the baby’s eyelids may be nevus erythematosus, chronic eczema and mosquito bites. 1. Nevus erythematosus: a congenital capillary malformation disease, typical lesions are light red, dark red or purplish-red patches of different sizes. Its etiology is unknown, and it occurs on the face and neck. Laser treatment is the preferred method, with little damage to the skin, but laser treatment needs to be carried out several times, and some patients still have light red patches after several treatments. 2. Chronic eczema: mainly manifested as a rash, accompanied by obvious itching, preferred in the face, ears, hands, feet, forearms and other exposed parts. The color is dark red, and papules and scales may appear on the red spots. 3. Mosquito bites: If the baby is bitten by mosquitoes, this symptom can also occur. It is recommended to take your baby to the hospital for a clear diagnosis and treatment.