Melanin deposits on the stomach should be improved by medication and physical therapy according to its etiology, and cannot be completely removed. The etiology is considered to be related to sun exposure, stretch marks or recurrent diseases such as eczema and dermatitis, and the treatment of pigmentation due to different etiologies will be a little different. 1. Sun exposure: If the local melanin pigmentation is caused by excessive sun exposure, first of all, avoid sun exposure and use vitamin C and other medications as prescribed by the doctor. If necessary, it can be treated by laser and other physical therapy. 2. Stretch marks: due to pregnancy with the growth of the fetus, abdominal collagen fibers may be fractured and the formation of stretch marks, generally with the passage of time, the color can gradually become lighter or disappear. If necessary, the symptoms can be improved by laser or radiofrequency, etc. It is also important to note that when pregnant, you can apply moisturizing cream to increase the elasticity of the skin in order to prevent stretch marks. 3. Eczema, dermatitis recurrence: Because eczema or dermatitis are chronic inflammatory diseases of the skin, it is easy to recur, which leads to skin pigmentation. At this time, we should actively treat the primary disease, and follow the doctor’s instructions to use glycerine lotion, Dinaid ointment and other medications. If necessary, you can pass the laser and other physical treatment. For melanin precipitation on the stomach, it is recommended that the patient go to a regular hospital, after clarifying the cause of the disease, under the guidance of the doctor to choose the appropriate way to actively treat.