Maybe emerging feathers. Hard to know. I'll tag in @Eggcessive to take a look too.
She's 7 years old, so it may be a bump she's had for years. I don't see any irritation at the site, so it may be something you just want to keep check on as she starts to feather in.
She's 7 years old, so it may be a bump she's had for years. I don't see any irritation at the site, so it may be something you just want to keep check on as she starts to feather in.