Well, here's the deal: I've seen little tiny gray/black bugs on the underside of the pot and on the trunk. The bottom of the trunk has turned darker also. What are they?! There was also a scale on the trunk that I easily pulled off and is now dieing on the dirt, but I'm afraid that there are more and they'll damage the tree.

I'm very worried and I need any advice possible!

Also, are scales really bugs and how do they get on a tree? It seems like they just appear there! THANKS!!!!!!!