Does the mark on Kimimaro's forehead have any significance? Kimimaro Kaguya has two dots on his forehead. In South Asia, it is called a bindi. Is it an identification mark, or does it have any significance like a curse mark? Is there any canon reason given for it?

I came across a source which said that it represents his clan, but the Kaguya clan doesn't have significant history in Naruto/Shippuden anime or manga. Is there any source for this claim?
The sign can be seen on all seen clan-members (okay; there's only Kimimaro and some guy in the anime), so I think that it's a clan-symbol.