The red marks after the scabs fall off from acne may be caused by capillary dilatation after inflammation of the skin, or it may be caused by scar formation due to improper treatment by the patient, which needs to be treated according to the specific cause of the disease, and usually includes medication and laser treatment. 1. Capillary dilatation: blood vessels are still dilated when the acne subsides and the scabs fall off, so the red marks will be formed, usually with the passage of time, it will slowly subside, if you want to recover quickly, you can use the cumulonimbin cream, polysulfonic acid mucopolysaccharide cream and other smear treatment, which can well promote the healing of wounds. 2. Scar formation: some patients in the long acne period, often with the hand squeeze, friction, easy to lead to the late acne scar formation, it is generally difficult to return to normal, often need to take laser treatment such as photorejuvenation and other methods to remove. If the red marks have not faded or eliminated, you can go to the hospital, in the usual way to do a good job of skin moisturizing and sunscreen, so that you can achieve a better therapeutic effect. Drugs should be used under the guidance of a doctor.