It seems that you are having facial melanosis
Pollutants,cosmetics,sunrays,soap,perfume,vitamin deficiencies..etc may be responsible.
Apply sun screen or keep the face covered to protect from sun.
Apply kojic acid
containing cream or gel at night.
Take glutathion,vitmin C and nicotinic acid tablets daily for long time.
Cleanse the face with face containing kojic acid or vitamin C
Have proper sleep and take healthy food.
Avoid stress and worries.
You may get benefit.
Still, you may consult nearby dermatologist
I hope you got my answer.
Dr. Ilyas Patel MD