Here’s why only some people have them:
1️⃣ Genetics & Anatomy
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The presence of back dimples is mostly genetic.
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They appear where ligaments or skin attach tightly to the underlying sacrum (tailbone area).
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If these attachments are closer or tighter, the skin forms a small inward dip.
2️⃣ Not Related to Body Fat
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Both slim and heavier people can have them.
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They’re more noticeable in people with less subcutaneous fat, but fat isn’t the cause.
3️⃣ Usually Harmless
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In adults, these dimples are just a normal anatomical variation.
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They rarely indicate a health problem unless they are accompanied by:
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Redness, swelling, or pain
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A deep or large dimple in newborns (can sometimes signal spinal defects)
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4️⃣ Fun Fact
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Sometimes called “Venus dimples of the back”, like the dimples some people have on their cheeks.
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They’re considered a harmless cosmetic trait — nature’s little signature!
If you want, I can explain why some babies’ back dimples can indicate a spinal issue, and how they differ from the harmless adult ones. It’s a subtle but important distinction.