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My baby yellow-eared slider has in the past three weeks developed a weird growth on the top of its head. The growth is white, round, and sticks straight up. It is flexible and bends over when the turtle retracts its head, then pops back up when the head comes out. My turtle acts quite healthy, energetic and has a great appetite, it doesn't seem sick or in pain. What could this growth be?

Can you post a picture of it? How many turtles do you have?