I am a17 year old. I have pimple s and oily face. My chest and throat area is also pretty much oily .but my hands and legs need moisturizing daily. For last 6or7 months my whole body is losing its natural yellowish skin color gradually & getting darker day by day. Specially face ,neck & abs area. I am using Stiefel acne aid bar for last 2&half months. Before that I used garner men power White for a month & a few face washes which really came to no help. Sometimes they gave my face a slightly red skin color which is different from my original slightly yellow skin tone. However in recent months my original skin color is fading out and getting darker. please prescribe medicine or skin care products & tips to lighten my face & body skin to restore my original skin color.