Any thoughts about what it might be? She's 8, btw. She's complained about it for a week or so now, and I've been expecting it to be something that went away on its own, but it doesn't seem to be.
It's a bit early for her to be 'developing', isn't it? And it's only one - it's noticeably redder than the other one, and a bit swollen. She says she hasn't bumped it or done anything to it. I'm going to make a doctor's appointment next week, I think, to see if they have any idea what it could be.