The really terrible thing about getting a pimple is not the pimple itself, but when it goes away it leaves an annoying reminder that it was there. If you have fair skin a pimple's going to leave a red mark which takes a long time to go away. If you have a darker complexion, a pimple's going to leave a brown mark and then you have to deal with the brown mark.
That's why I try to treat acne very aggressively in my skin of color patients, because not only do you want to treat the pimples but you want to prevent the dark marks which are really bothersome to the patient. There are many ways to treat the brown spots. I think the most effective is prescription hydroquinone. Hydroquinone is something that's very effective for lightening brown spots but some people don't like to use it because it's not a natural product. There are over-the-counter hyroquinones I don't think they work as well as the prescription ones. What I recommend to my patients who don't want to use hydroquinone is using a more natural product that has plant based lighteners. Some of these are arbutin, bearberry, mulberry, licorice, vitamin C, sea bright.
There are a whole host of them and those can be very good ways to lighten brown spots if you don't want to use the prescription product. Chemical peels also work wonderfully for lightening brown spots and certain chemical peels like salicylic acid and lactic acid are very safe for even darker complected patients.