hello doctor , Iam 39 years old woman, my problems is pigmentation on cheeks from last 3 years but i discovers then just last year, my skin is dry and i have to use some oil base cream always on my face , till the age 20 i never took any precautions to protect my self form sun and from last 15 years bez of my work nature i spend almost time in side of office so not much contact with sun still i have got pigmentation, in 210 September i discover my hypo thyroid and i took thyroxsin25 mg for 9 month and after that i stop taking medicine for that as my thyroid is all right, and my doctor said i have got pigmentation because of my thyroid problem , plz help as iam not able to treat them anymore.