You are having hypermelanosis
There are many causes of hypermelanosis.
Sun exposure, vitamin deficiensies ,endocrinal dysfunctions, genetic,
Drugs,allergies,skin diseases ,
You should be thoroughly examined.
You should be investigated to find out some internal cause.
This should be done by dermatologist.
Take vitamin C
, nicotinic acid and glutathion.
Apply kojic acid
and vitamin C contining cream.
Protect your skin form sun by sunscreen.
Wash the face with soap or face wash containing kojic acid.
Treat the disease, if found.
But you shoul consult dermatologist
for perfect treatment..ok
Dr.Ilyas Patel MD, , DVD