Kind of like a black lattice on the belly. Do a site search on stress marks and you will find several posts about them, some with pictures. Breyas had them all the time when he was little, even when he was sacked out and totally relaxed. I think you just have to learn your own dragon's signs sometimes.
It's like a black pattern on the belly. It looks cool and will make your dragon look scary. That is one of Beardie's way on communicating.
Bill, my juvie loves to snuggle, and demands attention all the time. This morning I woke up late, and when I turned on her light, I saw her so black and patterned. I picked her up and put her on my chest, within 5 minutes she seemed relaxed and all white.
mine has it all the time too, but don't let the name fool you. I thought from the name that it meant stress but some of the people that post more often here told me that its no big deal at all. they can come and go or stay as long, it doesn't really matter. it could mean there cold, could be if the food dish is an inch farther then normal, or it could be for no reason at all, so don't worry about it