I don't really have those Nevus spots.. My birth marks are about 3 inches long and it just looks like I dropped some brown water on me and it just stained. They're only really noticeable when I'm tan, because they'll get darker.

Either way, on the top of my left foot, I have a brown birth mark about 3 inches long and I have one that's like 2 inches long on the top of my left breast near the crease of my arm.
They're not moles by any means, just like stained skin. xD

I do have one of those moles next to my right ear though.