Something to be concerned about? Bicolor (supposedly) blenny with circular mark on side

[Wendi1bird]

just noticed this mark on the side of my blenny (which we were told she and her buddy are a paired set of bicolor, but neither has ever shown any other color) and I'm wondering if she injured herself, has a disease, or has been attacked?

 

[Jay Hemdal]

Looks like there is a lesion under its left pectoral fin? Tough to see clearly though. Can you post a short video?

Jay

 

[MnFish1]

IMHO - Fish get lesions. I would watch it