Curious About What Causes Dark Circles Under a Child’s Eyes? Dark circles under a child’s eyes can be caused by several factors including genetics, allergies, poor sleep quality, and sometimes heavy metal toxicity. Genetics can make some children more prone to dark circles. Allergies often cause inflammation and swelling, leading to discoloration. Poor sleep can result in a pale complexion, accentuating dark circles. In rare cases, heavy metal toxicity might contribute to these symptoms. Ensurin