Dear doctor, 13 year old girl hight 5.4 feet weight 70 kg. Normal menstrual cycle has facing some skin problems like her complexion getting dull day by day and she has vey black skin around the neck, armpits, inner thighs and on elbows. She is not taking any kind of medicines. I just want to know the reasons behind this black dull skin and can it be cured it self by the time and after loosing some weight. Pls guide in details. Thanks in advance.