Hello Lou, The swelling is due to accumulation of fluid/ blood (hematoma) secondary to the injury. This is a normal physiological mechanism of the body in response to any inflammatory process. Eyelids being located in a dependent part, the fluid has trickled down, resulting in the swelling. Symptomatic relief can be obtained with: 1. Ice application 2. Analgesics like diclofenac with serratiopeptidase preparation for reduction of swelling 3. Antibiotics for protection against secondary bacterial infection 4. Multivitamins & multimineral preparations to assist in wound healing. There is no need to worry, your son will be fine. However, if the swelling persists or associated with other complaints like fever, dizziness, vomiting, convulsions, etc. then you need to consult the treating Physician to rule out any intra-cranial injury. Wishing him a speedy recovery. Take care.