The blackening of acne marks will generally fade away, and you can pay attention to sun protection every day; When acne marks are serious, drugs or surgery can be used. The specific diagnosis and treatment should be carried out under the guidance of a doctor. Acne is often accompanied by local skin inflammation. After the inflammation is cleared, most of them will leave short-term post-inflammatory pigmentation, so they will leave black acne marks. However, mild and severe inflammation can make local capillaries dilate and proliferate, thus leaving red acne marks. After the acne is controlled, these two acne marks usually fade gradually, so pay attention to sun protection every day. For acne marks that fade slowly, you can treat them with drugs. For more serious acne, the skin surface after recovery is also uneven, called acne scar, which is difficult to treat. Tretinoin drugs can accelerate the removal of red and black acne marks because of their regulating effect on epidermal differentiation. For acne scars, topical drugs often fail to achieve satisfactory results, and it is difficult to completely restore the smoothness of the skin. However, some medical methods can improve the appearance of scars to a certain extent, such as dot matrix laser, microcrystalline grinding, chemical peeling, surgical treatment and so on.