Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concerns.. As per your complain it seems that increased pigmentation or darkening of the facial complexion in your case is due to Sun Tanning as you already admitted to be having regular sun exposure.. Other causes that can lead to darkening of the skin complexion can be exposure to head and chemical fumes, hormonal imbalances, side effects of some skin cosmetics etc.. Treatment that can be done is a combination of topical depigmentation creams and certain techniques.. You can start washing your face with Salicylic acid and glycolic acid containing facewash.. You can apply creams containing Kojic acid, glycolic acid and arbutin.. Vitamin E and C containing creams can help.. Creams that are rich in licorice extract and grapeseed extract can be helpful.. Take Vitamin C supplements.. Always apply a SPF 50 sunscreen lotion to reduce photosensitivity effect.. You should exfoliate your skin twice a week with a gentle face scrub.. Try to cover your face with a scarf when in sun.. Treatments like chemical peeling, Photofacial, Microdermabrasion, dermal rollers etc can be helpful.. Hope this information helps.. Thanks and regards. Dr.Honey Nandwani Arora.