What are the little bugs on my bed?

Basically there’s these little blackish bugs on the wood of my bunk bed. I’ve tried to get a good look at them but they won’t leave their little dark corner and when I shine my flashlight they run away. They also leave little black dots on the wood of my bed which, when removed with a Clorox wipe, leaves a greenish blacking stain on the wipe. If you can help figure out what kind of bug it is and how to remove of them that would be great