It's odd, because while I was there, there were photos from a leprosarium in Hawaii, and that triggered long buried memories of my aunt, a retired Army nurse, who had talked about visiting the Hawaiian leprosarium when I was a little kid. After visiting I tried to find more stuff online to read about it, but it's a phenomenon for which there is very, very little info available out there.
Look up Father Damien (Now St. Damien) of Kalaupapa on Molokai. This may be what you aunt talked about.