Acne, commonly known as “pimples” or “acne”, is characterized by acne, papules, pustules, nodules, cysts and scarring. However, in addition to medication, moderate to severe acne also requires physical therapy such as pricking and red and blue light to reduce inflammation. After a few months of treatment, my acne healed, but a large red mark and even a pit appeared! What is the best way? For red marks after acne, it is mainly due to the heavy inflammation during the time of acne, so that the dermis has not yet been repaired after the epidermis has been repaired. At this time, you can use some red removal lasers such as dye laser (585/595nm) or intense pulsed light (500-1200nm) for local vascular closure to speed up the repair process and make the skin enter a stable phase. Some post-acne patients who only have red marks but no pits will thus regain smooth skin.