Hard to see in your photo, but it looks like the lump is behind the eye/pushing out of the socket? If so, likely a bacteria infection, and you can probably treat with aquarium salt (1-2 tsp/gallon).Couple of days ago i saw a little lump-like thing on the eye of my silver arowana(6-7").i thought it was an injury he had at the shops as there were like 30 aros of his size.but the lump is getting bigger.so im starting to worry.He is eating fine.Wht shuld i do to remove it.No idea!..pls help.View attachment 1135069
Advice stands, aquarium salt @ 2tsp/gallon. Some say you have to ease them into the salt, I say (especially given the extent of the bulge...) That you can throw it in all at once. Dissolve in a fresh water on a water change.
Have you done anything to treat? how about water changes?I think its getting bigger and he seems to lose appetite...

