What’s this weird lump?

[Birdybathtime]

Ok so I’ve only just noticed this but there’s a weird yellow lump on my brahmas skin near her tail. When I mess with it she doesn’t seem bothered and it’s really stiff and firm. It also seems to be partially in her skin so that’s mostly what I’m worried about. What is it and what should I do??

 

[Birdybathtime]

Wait is this her oil gland? I’m so stupid omg lol

 

[Tumbleweedlynn]

You’re not stupid, I’m sure

Happy New Year