Acne will not make your skin darker. Nevertheless, healed single pimples may transform into brown spots (=hyperpigmentation). To prevent these brown spots, everyone with acne, should avoid excessive sun exposure and use an oil-free sunscreen in the morning. Once these brown spots are formed, it is possible to face them with different whitening creams that can be purchased over the counter. Check the "Tips" section of your personal routine on the app for specific products suggestions.