Hi, I am 23 years old. Since my childhood my underams, neck and inner thighs are black in colour. Also from 15years of age, acne is started on my back as well as on my face. I have tried many different soaps and body washes for them but it never reduced. They kept on coming and left me many marks on my back and face. In last 1 and half year, I put on 15kgs weight suddenly. Due to that, my periods are stopped from 6months. Now, the places which are blacks are becoming more dark and acne is also increasing. Please help me with this..