Red acne marks that do not fade after six months are usually caused by persistent dilation of capillaries. Patients can be improved through medication or laser treatment under the guidance of a specialist. Red acne marks are usually caused by inflammation and capillary dilatation caused by acne. Through active treatment, they will usually fade away in 2 weeks to 3 months. For the old red acne marks that have not been eliminated for half a year, they are caused by the continuous expansion of capillaries. Then the elimination of red acne marks is mainly to eliminate inflammation and promote local blood circulation as soon as possible; the patient can be improved by topical ointment such as Mucopolysaccharides Polysulfate under the guidance of doctors, or by photorejuvenation, pulsed dye laser and other ways. For patients with red acne marks that have not subsided for half a year, it is recommended to go to a regular hospital for examination and standardized treatment under the guidance of a specialist.