I have always used Jamaican Nadinola on my face and it works just fine, but now I have been using it and my face is breaking out with pimples and on close observation I realize that they have now changed from hydroquinone to ammoniated mercury instead. Could that be the source of my problem.

That's a serious problem. Do not use ANY skin lightening product with Mercury in it. It's extremely dangerous. It poisons the bloodstream, therefore toxic when used in cosmetics. You'll have an idea more or less what happens if your blood is infected with a deadly toxin, which can cause kidney or brain damage.