About
The character "癜" is a phonetic-semantic compound comprising the disease radical 疒 and the phonetic component 殿, which indicates its pronunciation. Etymologically, it falls within the category of characters denoting medical ailments, specifically those manifesting on the skin. In classical medical contexts, the term was applied to a variety of patchy skin discolorations, but its usage gradually narrowed to refer more precisely to vitiligo, a disorder characterized by depigmented white patches. The graphical construction of the character, with its semantic element clearly signaling illness, has seen no fundamental alteration in its standard composition.