Hey! I'm new on the site, didn't expect to ever need an account but desperate times call for desperate measures. I've been dealing with this problem for about a month now, and I can find absolutely NO HELP anywhere. All LFS's have been giving me different answers, and I've never seen anything like it. Let's see if Fishlore has a solution. So, for starters, I have a 30 gal sorority tank, 5 female bettas at the moment (Aphrodite, Hera, Nerid, Nyx, and Andromeda), along with various bottom feeders. Planted tank. Cycled. No outstanding issues. Been up for over a year now. About 6 months ago, one of my girls, Nerid, developed a mouth fungus and a strange lump on her 'chin', right were the gills meet, so I quarantined her and treated it, no problem. The lump shrunk, but never went away, but it didn't seem to bother her whatsoever, so I just left it alone. Fast forward to about a month ago, and 3 of my 5 girls now have this mystery bump! One of them, Andromeda, is completely unaffected, and the other, Aphrodite, has just been kind of a trainwreck for a while so I decided to have her tag along with the treatment. None of my other fish are affected whatsoever, only the bettas. I have the 4 of them in a 10 gal quarantine and have been trying everything to get rid of it - plain aquarium salt, herbal oil remedies, erythromycin... none of it seems to be making it shrink. The bump on one of them, Nyx, had opened up and then immediately shrunk and now she only has a small raised area, and I'm unsure if the medicine did it or if the bump had just ran it's course. So here's a summary: Andromeda (not pictured) - perfectly fine, remain in 30 gal Aphrodite (not pictured) - treating for overall bacterial diseases (fin stuff, etc) Nerid (reddish purple) - first one to show bump, possibly the starting point Hera (white) - Has growing bump, is strangely bloated, has never been ill before Nyx (blue and orange)- had bump, grew, opened, and has now shrunk All girls still have a healthy appetite, are not lethargic whatsoever, and have no other symptoms (besides Hera, who is abnormally bloated). I'm stumped. Please, any information would be greatly appreciated.