Diagnosis Needed - Strange Lump

[I Love my fishies]

Hi everyone I am not sure if you remember me or not I posted a few pic's on this froum of my beautiful boy Suay when i recievd him from Thailand (via Aqua bid) and I got some helpful advise from you all on keeping Bettas, as well as great advise with my 3 foot tank thank you.

Now I need your help again Suay has a massive lump under his gill/throat area he is still very active and is eating as normal I feed him a diet of frozen Mysis shrimp, frozen brine shrimp, frozen blood wrom and live black worm.

When I first noticed the lump I put some aquarim salt in his tank and it went down a little but about 1 week later is has appeared again and is massive and one side is alot bigger than the other side can anyone please advise me on what they think it is and if there is something I can get to help him i don't care how much it costs.

It is strange because his behaviour has not changed at all he eats well and is very active.

Sorry the pic's aren't very clear camera is not all that good for taking photo's of fish

Here are some pic's:

 

[WILDER]

If the lump looks solid it sounds like a tumour.
If lump are soft and fillled with fluid bacterial med.

 

[Colin_T]

Is the lump the swollen area that looks like he has eaten too mch, or the thin black line under his neck in the first picture?
The thin black line in the 1st pic is just his gills and is normal
The fat belly area looks like he has eaten way too much.
How often and how much do you feed him?
Do the scales around the belly look like they are sticking out from the body at all?

 

[I Love my fishies]

no scales arent sticking out the lump is strange cos it seems to stick out more on one side I am fasting him and have given him an epson salt bath fingers crossed.
I feed him live black worm and frozen mysis shrimp and frozen brine shrimp (but only one of these food each day)

 

[Colin_T]

It's definitely unnatural. How long ago did it appear and did it just blow up like that over night or was it a gradual increase in size?

If it is a tumor it would have grown over the course of weeks or months. An internal infection would happen virtually overnight. Generally with internal bacterial infections the fish stop feeding and sulk in the corner or hang under the surface doing nothing. Either way it is hard to treat internal problems in fish.