It seems like you have a frictional pigmentation. This can have many causes most common being constant touching and rubbing of skin on those areas. It can also be related to weight gain. Increased facial hair and pigmentation also suggests a hormonal imbalance for which you should see a endocrinologist (hormone specialist). Laser hair removal can be considered as an option for the increased facial hair.
Answered2016-01-12 11:14:21
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