How to tell for sure if it's loose skin or still fat?

Hi, I had open RNY,distal,transected and have lost 158 # in 13 months. Still have 50 or so to go. At this point in some places im not real sure if it's still fat or just loose skin. Such as my bottom roll... it seems pretty loose but my top roll still feels firm. And talk about my arms! They look my gramma's! lol. Just wanting to know if there's a certain way to tell for sure. Thanks!

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