A single bump like that is typically NOT a major issue in terms of it being an infection from some parasite. It could be a bacterial abscess from some injury. The injury could be from a fish bite, or even a sea urchin spine.
In the pictures, the fish's eye seems a bit cloudy, does it look like that in person?
Thank you for your feedback+ appreciated it.
Will the lump go away on its own? Do I have to feed them anything special?
The eye in person I believe looks good, I provide some pics of I took today, she moves alot so I tried my best. I think in that photo my glass was dirty