What is the disease in the movie mask with Cher?

In the movie "Mask," the character Rocky Dennis, played by Eric Stoltz, suffers from a rare genetic disorder called craniodiaphyseal dysplasia. This condition results in abnormal bone growth, leading to severe facial deformities and other complications. The film explores themes of acceptance, love, and the challenges faced by those with visible differences. Cher plays Rocky's mother, showcasing the deep bond between them despite societal prejudices.