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a big lump. Sounds to me as he have eaten something that have swollen in hes stomach, Never heard a fish with a tumor, anyway i think it could also be Aeromonas infection, There are many kinds of Aeromonas infections but here is two of them.
Also try to search on google for pictures and see if it is aeromonas.

Aeromonas infection are probably the most common bacterial disease diagnosed in cultured warmwater fish. Usually, mortality rates are low (10% or less) and losses may occur over a period of time (2 to 3 weeks or longer). In these instances, some factor; usually stress, has caused the fish to become more susceptible to the bacteria. Common sources of stress are poor water quality, overcrowding, or rough handling.

Aeromonas hydrophila is associated with diseases mainly found in fish and amphibians, because these organisms live in aquatic environments. It is linked to a disease found in frogs called red leg, which causes internal, sometimes fatal hemorrhaging. When infected with Aeromonas hydrophila, fish develop ulcers, tail rot, fin rot, and hemorrhagic septicaemia. Hemorrhagic septicaemia causes lesions that lead to scale shedding, hemorrhages in the gills and anal area, ulcers, exophthalmia, and abdominal swelling.

:o umm.. hope it lives.

There's not much that can be done for a fish with swim bladder disease. Have you tried giving it a salt bath? Look it up in a fish manual for instructions. If it doesn't work, you might have to destroy the fish humanely, rather than letting it suffer.

As for the torn fin, your fish might have Fin Rot. It can kill a fish easily, but there's remedies for it that you can buy at the pet shop. Fin Rot killed many of my fish - but one, Fin, survived.

Sadly, one of my fish a Shubunkin had Constipation, which has now lead to swim bladder disease. I feel really horrible about it because I believe it was my fault that Coy got constipated in the first place. I fed Coy and his/her bowl buddy Gurgle more Brine Shrimp in a sitting that he/her could handle. The next day I found Coy at the bottom of the 3 gallon bowl not moving very much...I have not fed him/her for about 4 days now but still no improvements. Today he can't swim without leaning on his side. Coy has been my 2nd longest living fish to date and I love him/her dearly, and as Canis Lupus pointed out not much can be done about it.

As for your fish I recommend you look up some sites for treatments and pronto! time is running out, or at least contact a vet.

http://www.google.com/search?hl=en&q=fi ... gle+Search

What?! Salt Bath? A salt bath for a fresh water fish :S does that sound like a good idea? Salt baths can sometimes help but not for a freshwater fish and its easy to overdose and that will kill the fish, To big amounts of salt is going to have the same effect as acid, But also most bacterias that can be found in water is VERY resistant so salt either kill the fish or it doest have any effect at all. ask a vet for some kind of medicine instead.