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Granny Zhao, 95, of Zhanjiang city, Guangdong province, says it first appeared three years ago.
"At first, it was only a mole, but it gradually grew and became like a horn," she said.
Zhao says the horn causes her little trouble except to affect her vision slightly: "It causes me no discomfort, but blocks part of my view."
But her family are hoping that medical experts can explain the phenomenon.