Even if your face is dark, you don't need to feel offended. Its good to have dark skin. As of now as you have started becoming dark. Its a side effect of the cream you hve applied. So I would suggest you to use natural remedies at home. Which can lighten your skin
Chandan, haldi and neem. Mix all these three ingredients and apply it paste thrice a week
You may find some results on your skin. It will take time as you hve already apply creams on your skin, but you can try it out.
Regards Dr. Alefiya.