What's That About?

If you look closely at my left arm, you see brown spots all over me. Weird huh? I bet your wondering what's that about. Well, first let me show you an example of them.

Look closely at this picture and try and notice the brown spots. If you didn't notice, look at the more visible one down here.

Can't you see it? What is going on there? What's up with my arms?

Look at my arm. Do you see the brown? Seriously, what's that all about?