I am taking synthroid for last six years. Beforr that I took took thyroxin for 12 years. Dark patches started appearing on my face from last 7 years. now i have dark patches on my forehead cheeks nose and between my eyebrows. I migrated to canada six years ago before that i lived in india and had to stay in sun for one or two hours a day sometimes for lesser time.I did not use sunscreen .
in canada i do not go in the sun, i use sunscreen very religiously still my patches are growing bigger and bigger
please help