Oh, I had a post and lost it! Ok, here goes again

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If by flap you mean the skin that hangs down, there isn't much you can do about it other than continue to lose weight and see what the end result is. You may still have fat in that area, and with more fat loss it may improve and come back up a bit. But really there is no way to tell what the end result will be until you get there. And if all is left is skin, you can hope for the best and maybe there is enough elasticity to bring it back up. Everybody is different. Just keep burning off that extra weight, and hope for the best!