Have you heard of using Baking Soda for dark marks? Well if you haven't, and you have some dark marks....i highly suggest you try this non-expensive method because it does work!!! I have used it on a couple marks i had from a bad breakout and it helped so much. I used it 1 to 2 times a day after i cleansed my face. You can get baking soda for under a buck...talk about cheap.
Below is a Homemade Acne Mask Recipe
Needed: Baking Soda & Water
Mix a little together in your hands after washing your face with a mild cleanser and apply gently to your skin. Once you've coated your face with the baking soda and water mix, let it sit while you do other things around the house, or relax and read a book. (i leave mines on for about 5mins, if it starts to sting/tingle, rinse)
Rinse the baking soda film off your face and feel how soft and clear it feels. If your skin enjoys this recipe, and your acne improves, then you may try it several times a week to help clear your acne
Hope This Helped =)