help....

Over the last year I have on both sides of my wasteline dark pigmintations that seem to be getting bigger and spread more around my wasteline.

I've read something about these in a article that it affects the liver or kidneys and i'm not sure what to do and where to go. I've gone to my doctor. Showed him the spots and he drew blood but never found anything.

Am I going to the wrong doctor? Who do I go see? I'm weak, and tired all the time. My doctor said it might be "thyrod problem' but the blood test came back with no indication that "thyrod" was the problem.