The disfigurements depicted include: the effects of illnesses such as leprosy or scleroderma (eg Minotaur & For Hope); facial birthmarks (eg Dread & The Shadow in the North); harelips (eg Smile & Precious Bane); facial deformaties (eg Isabelle & Merlin); and stranger disfigurements (eg Penelope).
These roles have a lot of cinematic history behind them are: the disfigured victim; the scarred and vengeful villainess; and the heroine who is almost miraculously transformed into a beauty (often with disturbing side-effects). And, of course, the more beautiful the actress behind the makeup the more shocking the transformation.
Skinema is an unusual and interesting website by a dermatologist interested in both the portrayal of skin disorders in the movies and in the real-life skin conditions of actors. It includes a useful (but not comprehensive) listing of realistic depictations of skin disorders in the movies.