I cannot see the pictures, as they are too dark on my monitor. Try processing them in a photo editor to raise brightness and contrast. Some pretty poor exposures can be rescued, that way.
From your description it does not sound like columnaris (cottonmouth disease), but could be thyroid disease.
If it is a benign thyroid tumor, the treatment takes about 4 weeks. Make a stock solution of 0.5g iodine and 5g potassium iodide in 100 ml of water.
Add 1 drop of stock solution to every 5 l of aquarium water. That is, one ml to every 50 l of aquarium water. Treat in regular aquarium, as everything is low on iodides if the fish get "goiters." Add proportional amounts with each water change.
The above is from Untergasser, by the way.
I'm amused when hack fish authors advise not to use iodized salt in the aquarium. The above treatment is hundreds of times as much iodide as you would get from iodized salt, and is quite harmless to fish. The bad stuff in iodized salt is only in the premium brands, where they use silica gel as the free-running (anti-caking) agent. Cheaper salt uses sodium ferrocyanide (Yellow Prussiate of Soda) that is more soluble and easier on the gills than the "powdered glass" in the fancy brands.
Wright
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