water storage in old fat cells?

First off, thanks to all the people who answer my questions here! I would like to ask a strange question. I am a nurse, so I wear scrubs at navel level. I lost A LOT of weight, so I have old fat cells in my loose skin that hang down. I have noticed that when I am at work, or wear pants that pull on stomach and put pressure of that area seems to cause the fat cells to maybe fill up? goes from feeling like skin to edematis... kind of like a stress ball. if I press it, my fingers leave an indentation for a few seconds. Is this normal? Thanks again!

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