To my knowledge, the only time there is extra skin is if you lose a huge amount of weight in a short amount of time, like on those silly fad diets. People who get surgery to lose weight also have extra skin, but it's generally removed while they're in surgery.
Skin is elastic, but it has its limits (which is why you get stretch marks when you grow too fast or gain weight fast).
If you lose weight gradually your skin will shrink with your body and should stay firm.
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a question about what happens if you do lose weight 
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