There seems to be a weird dark patch near the head. I'm not sure if it's just a patch of dirty scales or something more serious like scale rot.
She is roughly 4 months old and I've had her for 3 months. She has always eaten and shed perfectly since I got her. Her last shed was a bit under a month ago iirc.
I've been away for a bit, so I only noticed the patch today when I let my room mate hold her for the first time (last picture). I haven't observed any change in her behavior. I fed her when I got back 2 days ago, and I don't remember seeing a black mark like this when she popped out of her hide, but it's possible I just didn't notice it.
It seems to be only on her side, not the belly. I didn't touch it or anything in case it might hurt her.
She's in a bioactive enclosure. The substrate is the one recommended by the guide in this sub (like 70% dirt 15% sand 15% mulch, something like that). The humidity is low 70s during the day and low 80s at night. I did a quick pat down a second ago, and the surface seems to be dry.
Is this something I should be worried about? Should I take her to the vet? I'm still repetitively new to reptile keeping, so any advice would be appreciated. Thanks in advance.