If you can move it around but it's stuck in there, then my guess is a tick. Alot of tines when you gently move it you can see their legs squirming around.
I've seen them look exactly like a BB. I've mistaken them for a BB before. I have a set of tick twisters, they have 2 sizes for large and...
Ticks cause a few things. When there was one stuck in my dog for a while, then I pulled it out and that spot stayed like a swollen bump for a long time. 🤷♀️