In recent years, more patients with congenital nevus or giant nevus visit the clinic, and the incidence rate is on the rise, which may be analyzed to be related to the current environmental safety and food safety. If you find a large nevus (with a diameter of more than 5mm) on the skin of your infant’s body surface, early treatment is recommended. What is a congenital nevus? The mole or nevus commonly known in daily life is medically known as a melanocytic nevus. Most nevi appear in the second to sixth year of life; however, there are a few people who have a nevus that was already present when they were born, which is known as a giant congenital melanocytic nevus. Giant congenital melanocytic nevus is referred to as congenital giant nevus, and the diagnostic standard of giant nevus can be reached if the area of any part of the nevus that existed at the time of birth is more than 144cm or the diameter of the nevus is more than 20cm or the area of nevus of limb or trunk is more than 900cm2. However, the diagnosis of congenital giant nevus cannot depend on the absolute size of the area, but should also consider its relative size in combination with the patient’s body surface area. If the lesion covers special parts such as eyelids, ears, hands, etc., forming a larger impact and requiring higher repair, if the area is smaller than the above standard, it can also be called giant nevus. Congenital giant nevus should be given timely treatment, if not treated in time, it may become cancerous, there are Chinese domestic scholars on the malignant rate of congenital giant nevus statistics for 1%-20%, foreign scholars statistics for 1.2%-42%. Don’t let the nevus ruin the child’s life Congenital nevus in addition to the size is not equal, the form is often varied, can be spots, macules, papules, plaques, nodules, papillomas or with the tip of the papule, some in the large plaque on the basis of the size of the nodules, the edge can be irregular, the surface may not be smooth, pigmentation may not be uniform, the lesions are often also thick hairs. However, no matter what shape and where it exists in the child, it will bring psychological shadow to the child. If the nevus exists on the face, the child will be stared at by people with abnormal eyes since childhood, resulting in low self-esteem, or even serious autism and unwillingness to meet people. Effective treatments for nevi This is part of the nevus tissue removed from a three-year-old child with a giant nevus. The surgery was successful and the child recovered well. 1, non-surgical treatment includes liquid nitrogen freezing, laser, electrolysis, electrocautery, high-frequency electric knife, and trichloroacetic acid, carbolic acid and other chemical corrosion method, the principle is to use different methods to make the lesion local tissue destruction, and gradually fall off, rely on the regeneration of the surrounding tissue repair. Although surgery can be avoided, the depth of tissue destruction is not easy to grasp, too shallow treatment is not complete and the formation of irritating factors, too deep is left behind depressed scar, as well as after the treatment of the local skin color is different from the surrounding tissues and so on are its shortcomings; 2, surgical treatment of any type of nevus, regardless of the size of the area can be applied. The curative effect is stable and reliable, and the cut off tissue can also be further pathologically examined.