Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain there are a number of depigmenting agents that are available with different commercial names that can help in fading dark spots..
I would suggest you that as you are already using AMBI fade cream that contains
Hydroquinone and other ingredients like lactic acid along with African black soap, they are appropriate for reducing the dark spots..
The face mask that you are talking about, you did not specify the name so it is difficult to tell you about its efficacy as without knowing its formulation I cannot comment on it..
You can also apply creams containing
Kojic acid,
glycolic acid and arbutin..
You can apply
Vitamin E gel..
Exfoliate your skin twice a week..
Drink plenty of water and limit sun exposure..
All these measures will help in reducing the pigmentation faster and improve your skin..
You can also go for treatments like Microdrmabrasion, photofacial and chemical peeling..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.