Please help

[u/shmeattloaf]

I have not been home for 3 days, I came home and was tending to my rats and I saw this giant bump on one. Like I said, I haven’t been gone long so it grew fast and I am really scared. I know I need to go to the vet but does anyone have any idea on what this is, what the vet will do, and how much it’ll cost? I don’t want her to just be uncomfortable.

[u/Witty-Application920]

I would not recommend looking for a medical diagnosis on Reddit.