My Skin Is Too Dark And So By Someone Suggestion

My skin is too dark and so by someone suggestion i started using Panderm plus cream...and the effect is very much positive and it has got hold of pigmentation level.....now I just want to know whether the usage of this cream for a long term is a good option?
Will it cause any long term problem. as of now I dont even have a single pimple on my face and i am using it 3 to 4 times a week.