jsker
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It looks like one of two things. Lympho or - and I lean toward this second one- an infection. Looks like it was an injury that is now getting infected. You'll want to treat, in QT, with kanaplex or furan2 or both at the same time if you can find both. You'll dose them at the same time, following the dosing directions for each. Do a water change every other day and redose each med. Do this for 10 days minimum... it may be a bit longer as antibiotics are slow acting in fish.
+1 and also dose amino acids and vitamin M to help with the immune system.