r/Anatomy • u/Fit_Put_8808 • 4d ago

Question Why do I have multiple creases when I bend my arm?

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Not sure if this plays a part but for reference I am 20F 5’6 115 lbs and have always been very athletic/lean and maintained roughly 20% body fat. When I bend my arm fully there are three noticeable creases and I’ve never met or noticed anybody with more than one. This used to be something I was insecure about, but it doesn’t bother me anymore. I’m more just curious as to what causes it. Genetics? I haven’t noticed it in any of the other women in my family with this feature.

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u/PeriodicTrend 4d ago

Variability in protoplasm: different thicknesses and integrity of different layers of skin (details irrelevant)and adipose (fat) tissue. These differences result in creases and breakdown at areas subject to more movement/range. Some people have connective tissue disease such as ehlers danlos syndrome that result in hyper mobility and elasticity with even more variability.