Darkening of the cavum rind can be caused by a sign of conditions. Since others in your sept tally the aforesaid problem, you may know acanthosis nigricans, which can be inheritable and Novus Anti Aging Serumis characterized by sour patches of deep, smooth tegument on the underarms, thighs, and/or sides of the pet. It's often related with insulin action or additional hormonal imbalances. It's thought that elevated insulin levels can…