Small mysterious bump develops on my Peacock cichlid's head

[kaCampbell]

Hi guys-

I'm hoping somebody can help me out, my tank boss is has recently developed a small bump on the top of his head, right before the dorsal fin. It's pretty much the same color of the fish itself, though a bit white in some areas. It almost looks like a bump from when you hit your head. This is a 6"+ Red Shoulder (possibly hybrid) Peacock cichlid. I'm wondering if it's normal or something to be concerned about. Aggression? Bacterial infection? Fungus? 

Any thoughts??? 

Thanks in advance. 

Oh, initially thought it could be HITH but its 100% a mound, or protrusion and not an indentation to further suggest this. 

[kaCampbell]

Forgot to list recent parameters-

Temperature- 81

PH- 7.8

Nitrite- 0

Nitrate- 30-40

Ammonia- 0

Weekly or biweekly WC 

[FrozenFins]

I wonder if its a tumor starting to develop. If this is the case the only treatment is surgery, so unless your prepared to spend a pretty penny on your fish he is most likely gonna die

[kaCampbell]

Oh noooo. I hope that's not the case 😕