Not our mother's Ambi!
I was terrified of Ambi for years because my older sister used it back in the 70's and she ended up having some skin discoloration from it. But last year I used it to clear up some dark spots I had noticed on my forehead, after reading rave reviews. It seems their formula has changed over the years. The spots cleared up after about 5 or 6 weeks. I had no side effects or discoloration. A word of caution - just apply a little bit, otherwise it will take forever to absorb it into your skin.