"I haven't been able to stop thinking about it," HuffPost reporter Ashley Feinberg said in a tweet.
Keratin filaments in our cells are essential for growing hair, skin, and nails.
This kind of growth is sometimes referred to as a senile wart.
"Those are kind of random," Suozzi said. "You're partly genetically predisposed to them, and they're also worse in patients that have more sun damage."
But if it's not a seborrheic barnacle, the spot could be something more dangerous.
"The risk of any one of them becoming a skin cancer is pretty low," Suozzi said. "Somewhere from one in 100 to one in 1,000."
One of the most common, effective ways to treat keratosis spots is to freeze them.
That's "inflammation from, likely, liquid nitrogen treatment," Suozzi said. "That would be my educated guess."
She said the key clue is the little circle of white and red around the affected area on his cheek, which can be seen in this photo taken on Monday.
But the freezing treatment for keratosis spots doesn't always work, and can leave that patch of skin lightened.
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