On my face having pimples and black mark

Thanks for the question. Acne is an inflammatory problem and the inflammation from acne bumps can irritate the colour producing cells in the skin. This can result in darker (hyperpigmented) or lighter (hypopigmented) skin in the area of an acne bump. Discoloration from acne can be very frustrating. Here is how I treat it. 1) Treat and cure the patient's acne. This is most important. The inflammatory process of acne must be shut down in order to prevent skin discoloration. Each patient is different, however, all patient's must be put on a successful regimen for their acne before the discoloration can truly improve. 2) Treat the discoloration. There are multiple ways to help with the discoloration. The most often successful and important are to practice sun protection with strict sun screen use and to use a fade cream such as hydroquinone. In addition to these basic treatment, select patients may benefit from chemical peels, retinoid creams, and laser treatments.