臀部上方后腰处有两个“小酒窝”

这叫骶骨酒窝（sacral dimple）
A sacral dimple or pilonidal dimple is a small hole located just above the buttocks. The name comes from the sacrum, the bone at the end of the spine, over which the dimples are found. More than 2% of babies may have such dimples; almost all of these are very minor. However, it may be a sign of Spina bifida: even so this is usually the spina bifida occulta form which is the least serious kind. Sacral dimples are usually spotted in post-natal checks by a pediatrician, who will check:

再仔细看看，不仅仅是两个“小酒窝”，是6个--8个。

正常，女生后面都有。那是脊柱跟骨盆的结合处。有空我看看。

正常啊

正常么.....还真没注意过呢