Pigment cell hyperplasia generally refers to the proliferation of melanocytes, which often form nevus nigra, and can be proliferated when there is sufficient nutrition or cancerous lesions, and can be treated with surgery or laser freezing by medical treatment. Melanocyte hyperplasia, the main reason is due to the surrounding nutrient-rich or local stimulation, melanocyte hyperplasia is active, which will lead to the nevus of melanin become larger in scope and metabolism accelerated, this situation is generally a benign lesion, do not need special treatment. If the nevus on the body suddenly increases in size, itches and breaks down, or grows on the parts that are easy to be rubbed, such as the palms of the hands, soles of the feet, etc., it may be cancerous, and you should consult a doctor in time for treatment. You can go to the dermatology department of the hospital, and the treatment options are usually laser treatment or local surgery.