lichenification
noun
li·chen·i·fi·ca·tion
lī-ˌken-ə-fə-ˈkā-shən
ˌlī-kən-
: the process by which skin becomes hardened and leathery or lichenoid usually as a result of chronic irritation
also
: a patch of skin so modified
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Merriam-Webster unabridged
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