sudden appearance of brown spots on abdomen

[Ethelpea]

Hi all, wondering if anyone can point me in the right direction.  I've developed, seemingly overnight, brown (not red) spots (like liver spots) all over my chest and abdomen.  Probably around 50 of them.  Any ideas?  Liver function?  

I haven't felt well for about 1 month and lately I've been very run down. 

Thanks!