Hi, The dark pigmentation near your thigh area is known as Post Inflammatory Hyperpigmentation/ Post Inflammatory Hypermelanosis (PIH) or it can be sue to familial tendency in bit over-weight persons. It is a condition of the skin arising from trauma (of any nature) to the skin resulting healing with pigmentation For your dark pigmentation ad black heads you can use azelaic acid cream or Kojic acid cream or glycolic acid cream or licorice extract or arbutine creams at night time in guidance of dermatologist. Most importantly you should reduce your weight if you are overweight. Take care.