I noticed something weird on Spike's carapace today. There were (are) areas of it that are discolored or look different than the rest of his shell. I'm not sure what it's from. When I give him a soak, I usually spoon water onto his carapace. When I did this today, the weird marks on his carapace seemed almost hydrophobic, as if the water just didn't want to pool up at those areas. Not sure if it's burn marks, abrasions, or something else. I've attached a photo.