Singer and actress Suzy has a big mole on her right wrist. This stands out more when she wears something sleeveless. The mole is known as 'Suzy's mole' or 'Suzy's wrist mole'.
She appeared on a TV show in 2012 with Jo Kwon from 2AM and while playing a game of spitting watermelon seeds, Jo Kwon pointed out that a seed landed on her wrist and caused laughter in the studio. He really thought the mole was a watermelon seed.
IU copied Suzy's mole by sticking a watermelon seed on her wrist. It is hard to tell which is the real mole and which is the watermelon seed.