Coffee spot is also known as coffee milk spot, so milk spot and coffee spot belong to the same kind of spot, there is no difference between the two. Cafe au lait milk spot is a relatively common pigmentation skin disease, mostly hereditary skin disease, the cause of which has not been fully clarified, mainly considered to be caused by heredity, but also for the manifestation of a variety of systemic disorders, such as neurofibroma, Auerbricht’s syndrome and so on. Cafe au lait milk spots can occur in all parts of the skin, can bleed at birth or after birth, and can appear to increase in number throughout childhood. Cafe au lait milk spots are light brown spots, tan to dark brown, vary in size, mainly round, ovoid and irregular in shape, with clear borders and smooth surfaces. Once cafe au lait milk spots appear, it is necessary to pay attention to go to the regular hospital in time, and make a clear diagnosis under the guidance of specialized doctors to avoid delaying the condition.