Tetra Growth On Mouth

[newtofishies]

Hello everyone, We really need some advice for one of our tetras. It had a small growth, which looks like it is extending from his lower jaw. It is white/pink in colour and looks like a tumour-type growth. It is getting bigger. The tetra itself seems happy enough; it is able to eat mini-pellets, but it is now smaller than the others and seems to need to 'right itself' as the growth is weighing it down at the front. Is there anything we can do? Thanks, Vicki

Hopefully, I've managed to attach a photo of the tetra, although it's not great - I'll try and get a better one.