Maybe a little on the left side where the arch begins. If it's a slight blotch it's not much more than natural variation you'd expect to see in the wood. You might be able to get it a bit lighter with careful use of thinner. I probably would not attempt it, not being very good at staining I'd be nervous about making it worse.

This seems like the sort of thing that my MD friend told me he learned in surgery rotation in med school: "Excellent is the enemy of the very good." It looks very good. I have lost count of the times I have really messed something up when it was already very good ;-)