_:vb50946660 . _:vb50946660 . _:vb50946660 . _:vb50946660 . _:vb50946660 "url:https://medlineplus.gov/skinpigmentationdisorders.html"^^ . _:vb50946660 "A skin disease that is characterized by discoloration of the skin."^^ . _:vb50946660 .