I feel that you are having facial melanosis
There may be some cause.
That may be sun exposure,hormonal imbalance ,soap,cosmetics,talcum powder, cosmetics,pollution,internal diseases,vitamin deficiencies..etc.
You consult dermatologist
Blood tests may be done to rule out any internal disease.
Thorough history may be taken to find out some external cause.
If cause is found , take treatment to alleviate.
Apply kojic acid
Take glutathion ,vitamin C
and nicotinic acid.
I think you may be benefitted.
I hope you got my answer.
Dr. Ilyas Patel MD