Dark spot on iris??

I'm not sure if this is the right room or not but I was just wondering if anyone else has a dark spot on their iris? I just recently noticed this dark brown spot. It hasn't always been there. I have hazel eyes that are green with light brown around my pupil. My other eye does not have this.

Does anyone else have this?

Update:

Thanks for everyone's responses! I have been getting quite a lot of new freckles on my face and arms, but I had no idea you could get them on your eyes too! It's very interesting!!