So I went in to the dr today about a lump I found on my chest last week. He said he thought he knew what it was but once he examined it he realized he didn't and referred me for an ultrasound tomorrow. I'm confused. Aren't ultrasounds for showing that there's something there? Can they actually show what it's made of or if it's a cyst or tumor? I'm not a fan of being charged 100s of dollars for things I don't need.