_:vb50946659 . _:vb50946659 "An eyelid disease that is characterized by dark eyelids."^^ . _:vb50946659 . _:vb50946659 . _:vb50946659 "url:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4756872/"^^ . _:vb50946659 .