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*poke*
"Cry 'Havoc!' and let slip the dogs of... AGH! MY EYE!"
Was that character supposed to be a burn victim? His makeup effects look like the Klingon version of that mama cat that ran back into a house fire repeatedly to rescue her kittens and she kind of melted.
Memory Alpha:
Chang's appearance, as well as his affection for the works of the Human playwright Shakespeare, may be explained in part by the Klingon augment virus that spread through the Empire in the mid-22nd century. Among its other effects, the virus dissolved Klingon cranial ridges and gave its victims a more Human appearance (see "Affliction"). One of Chang's ancestors may have been a "smooth-headed" Klingon who was exposed to the retrovirus. Also, he lost an eye and wore a eyepatch similar to Claus von Stauffenberg.
But mostly, Christopher Plummer didn't want to put up with bulky makeup.