How i can eliminate spots on the skin caused by acne?please

Apply a paste of orange peel regularly for few weeks. It is a natural bleach and help lighten up blemishes. See below link:

I personally use vitamin B pills. Take a safety pin and poke them open, and squeeze out onto a cotton swab. Then apply to the marks. This also works for scares from cuts or burns. Using it on my motorcycle burn from the exhaust pipe and it has gotten at least 45% lighter.