Thanks a lot guys!
Turns out Holly is okay. The lump behind her ear was a cyst, and should just be left alone. I have o pay attention though if it gets bigger, because if it does, we will have to get it medically removed. I also have to keep checking Holly, since hedgehogs are tumor factories.
Still though, I'm was and still am literally overcome with happiness. Feel like doing a little jog.
Anyways, thanks again MAP members!!