When your liver gets clogged up with toxic stuff it backs up through the nervous system to your forehead and causes skin eruptions. You just need to do a liver cleanse. Borax works pretty good.
I just read to cut a lemon in two and rub it on your liver spots to bleach them. I don't know. I would probably just go to the dermatologist and buy some M.D.Forte age spot remover. It works. It's been years since I used it; it may not even be available any more.