The black marks left behind after eczema is a pigmentation, you can take general treatment, drug treatment, physical therapy and other measures. 1. General treatment: keep the skin hygiene, clean, avoid scratching, avoid friction and other stimuli, while going out to pay attention to sunscreen, eat more rich in vitamins, crude fiber-rich fruits and vegetables, life and diet regular, appropriate exercise to promote the metabolism, along with the metabolism, it is possible to gradually recover. 2. medication: can be used externally cumulonimbus ointment, vitamin E ointment and other drugs have the role of auxiliary treatment. 3. Physical therapy: you can go to the hospital to take physical therapy measures such as laser, through the thermal effect of the laser, destroying the melanin particles under the skin, removing hyperpigmentation. If you need to use medication, you should consult a doctor in time, use medication under the guidance of the doctor, and avoid abusing medication by yourself.