hi, i m 38 year old lady, my height is 5'1",weight 50kg, i have thyroid problem since 7 years, i m taking eltroxin 150 gm. i have dark spot under the knee to foot from last 4-5 years, and in my face skin also looking very dull, as it looks like black and white but very lightly, it never looks a glowing skin. so i need your suggestion how to get relief from this problem.