There are many causes of redness in the lower eyelids of children, such as trauma, allergic conjunctivitis, blepharitis, etc. 1. Trauma: children usually in the process of playing, if the eyes are accidentally caused by external force hit or collision, can lead to the phenomenon of redness of the lower eyelid, accompanied by pain, bruising and other phenomena. 2. Allergic conjunctivitis: If the child himself belongs to the allergic body, then after the eye contact with allergens, allergic reactions may occur, triggering allergic conjunctivitis, so the phenomenon of children’s lower eyelid redness, and may be accompanied by a rash, itching and other phenomena. 3. Blepharitis: blepharitis is due to the eyelid edge of the eyelash follicle root of the sebaceous glands, lid glands suffered pathogenic bacteria infection, due to prolonged inflammation stimulation, can be formed in the eyelid area of the red painful lump, so it will lead to children’s lower eyelid redness. There are many causes of lower eyelid redness in children, and it is advisable to consult a doctor as soon as possible after the symptoms appear, and take standardized treatment in strict compliance with the doctor’s instructions after the cause is clarified.