There are various treatment for pigmentation. From creams containing hydroquinone to milder ones of Kojic acid, niacinamide, arbutin. There is options of glutathione injections to oral tablets with vitamin C, also laser toning also gives good results. Laser toning using Q switch Nd Yag laser is an option but results variable. You may need 6-8 sessions at 3 weeks gap and usually charged per sitting or as a package. Consult a dermatologist.