Strange black spots on P. grandis

[ludrx]

Hello,
My Phelsuma grandis has some strange black spots on its beak. What could this be?

Thank you very much and best regards

 

[acpart]

Looks kind of like dirt to me. Has it been digging?

Aliza

 

[ludrx]

No, it's been there for several weeks now, and it hasn't gone away even after the last molt.