It's easy to point out that this story is based on actual events once the cameras start rolling. It is also backed up by excellent performances by Cher and Eric Stoltz.
"Mask" is a tender, heart-warming story of a young teenager named Rocky Dennis who is very intelligent and emotionally sensitive as well. However, he is scarred badly due to a rare disease that has disfigured his face since he was born. As always people who pass him by or approach him a first glance feel slightly intimidated by his deformity. But by not letting these fears get to him, he becomes well over with his peers as they learn to accept him for who he is, not by what he looks like.
Rocky also gets a boost of confidence from his mother, Rusty Dennis, played with sheer excellence by Cher. Rusty is a gorgeous, single mother with problems of her own too. She spends most of her time hanging around with biker gangs, she drinks, smokes, is addicted to drugs, but in spite of her problems, she continues to love her son and will bend over backwards to defend him from anyone who puts him to a lesser degree. For example, when the school principal who recommended that her deformed son be placed in a "special" school and how she told him off to his face that he will thrive with the normal students and threatened to sue him, shows that her love for her son will always be first before her. But with his progress and his strong academic showings, Rocky graduates as valedictorian of his class.
Ever since he was born, Rusty delivered tough love towards her son, not to the point where he'll suffer a nervous breakdown, but just as way to keep him motivated and to blend in with people his own age like as though he was a normal child, without taking advantage of his deformity. And Rocky continued that legacy, from the morning he wakes up to face the world, inflate his self-confidence, keeping the glass half-full and just be happy with the world around him in what little time he has on this Earth. And eventually through tiring persuasion to get his mother to clean up her act, the audience finds more ways to love Rocky for what he really is. You love him because Rocky is a kid who loves people back which to this day is a precious commodity that you rarely see these days.
I have seen "Mask" many times and every time I watch the movie, tissue paper is never behind. It is a coming-of-age story that deals with triumphs and failures of having an incurable disease and is handled in a believable and sensitive approach. But the great center in the story is not entirely centered on the kid's physical illness, but the bonding between a mother and her son.