You are having facial melanosis
. It may be melasma
. There are many causes. You avoid sun exposure. You can use sunscreen . Locally you apply kozic acid and vitamin C
containing cream daily at night. Orally you take Vitamin C 500 mg thrice a day, nicotinic acid 250 mg thrice a day, and take glutathion containing antioxidant capsule once a day. Cleanse the face with glycolic acid
containg face wash.Avoid mental stress. Take healthy food and good sleep. I hope you may be improved.