Axolotl with bruise

[dipsydoodle]

Hi All,

Looking for some help, my axolotl has what appears to be a bruise just above her nostril.

She lives alone, nothing sharp in tank, water parameters are fine and is approximately 7 years old.

I noticed the 'bruise' last week, a week later it doesn't look like there is any change.

Pictures from this morning

Any ideas?

Thank you

20180525_071345

20180525_071312

20180525_071317

 

[Biev]

From the pictures, it also looks like there may be swelling and exophthalmia (pop-eye). Can you confirm? Is it both eyes or just one? Is she looking bloated? Any changes in behavior (refusing food etc.)?

 

[dipsydoodle]

No bloating, eating normally.

Just the one side where the "bruise" is.

Not noticed anything unusual going on in looks or behaviour.

It's a right mystery :/

Edit: just been looking at pop eye in axolotls and her eyes look nothing like it (thankfully). I think it's mostly just bad camera angle