The dark marks left by eczema usually take 3-6 months to fade away. Eczema is an allergic disease that makes the patient feel very itchy and prone to frequent scratching during episodes of eczema. After the eczema is cured, temporary pigmentation will remain on the surface of the skin. This pigmentation is a post-inflammatory pigmentation formed after the eczema stays on the surface of the body and stimulates the surrounding pigment cells, which needs to be gradually engulfed by its own macrophages to gradually fade away, so it is relatively slow and generally stays on the surface of the skin for 3-6 months, then it will gradually fade away naturally and the color will gradually fade away and eventually be absorbed. If you want to accelerate the fading of this black mark, you can apply some vitamin e cream with antioxidant effect locally, or you can choose laser irradiation under the guidance of your doctor.