Hello, I can understand your concern for pigmentation and resultant problem in your job. After analyzing the query I can get that the condition is known as Post inflammatory hyper-pigmentation or PIH. The most vital part is to use a broad spectrum sunscreen regularly to reduce the further tendency. If I were your treating dermatologist then for your spots I would have prescribed a cream (under dermatological supervision) containing Kojic acid with arbutin and mulberry extract in it or a cream containing tyrostatin. These are one of the safest creams to be applied. Apply any of these creams in a very thin layer at night time only so that these should not be visible to naked eye. Eat best of your diet with fruits and vegetable to get early renewal of skin and fast recovery. All the best.