Mask is a 1985 American biographical drama film directed by Peter Bogdanovich, starring Cher, Sam Elliott, and Eric Stoltz with supporting roles played by Dennis Burkley, Laura Dern, Estelle Getty, and Richard Dysart. Cher received the 1985 Cannes Film Festival award for Best Actress. The film is based on the life and early death of Roy L. "Rocky" Dennis, a boy who had craniodiaphyseal dysplasia, an extremely rare disorder known commonly as lionitis due to the disfiguring cranial enlargements that it causes. Mask won the Academy Award for Best Makeup while Cher and Stoltz received Golden Globe Award nominations for their performances.
(Summary from Wikipedia)