I have skin related concern ,i am having hypothyroid which is 7 right now .and since last 1 years my skin colour is getting darker .specially at the area like sides of neck ,elbow, knees,these areas are getting more darker and other areas skin tone is also changing to the darker end .my weight is increasing since 8 months .it has increased from 58 to 65 since dec 2021. I am taking thyronorm 50 mg .what should I do.