I do not have a dimple but have a very distintive line, that runs up a bit. DOes that mean anything?
I am not sure. @ehc918 may know more about it.
This article mentions some related features found near or within the buttock crease which may signify neural tube issues:
- swelling in the area
- skin tags
- a birthmark in the area
- a patch of hair by the dimple
- a fatty lump
- a dimple larger or deeper than 5 millimeters (mm)