Black spots

[michaeljr]

Hey guys, I've had my axolotl for almost 9 months now, she recently developed these black spots around the cloaca area. I first started noticing these spots appear on her back along her tail. Her behaviour hasn't changed and the spots have been there for almost a month now. I was wondering if anyone has any thoughts on what this could be?

 

[Hayleyy]

My first guess would be pigmentation. Do they look like they are part of her skin, or do they look attached?