Is this normal? My sulcata seems to be having discoloration? Not sure. The brown lines are normal, he's always had them. I'm worried about the yellow.
The yellow spots are what I’m concerned about. I didn’t seem them before but Idk.
I see the areas that concern you when I enlarge the picture. If he were any other species I would think it was a precursor to shell rot, but sulcatas aren't prone to shell rot. Sorry, I must admit, I don't know about those spots.
I don't keep Sulcata. But I've seen similar circles and I've associated them with mineral staining.
Whether that is the case or not, I wouldn't be concerned.