Meat nevus generally refers to intradermal nevus and mixed nevus, both of which are pigmented nevi. They are generally diagnosed by the results of histopathologic examination and have a certain possibility of malignant transformation, but the rate of malignant transformation is low. Intradermal nevus and mixed nevus are benign skin tumors composed of nevus cells. Intradermal nevus is a hemispherical elevated papule or nodule with smooth or papillary surface, usually not enlarged, and is mostly seen on the head and neck. Mixed nevi are usually flat or slightly elevated above the skin surface. Moles occurring in friction-prone or injury-prone areas such as palm and plantar areas, armpits, waist, groin and shoulders have a certain possibility of malignant transformation and can be surgically excised on an elective basis. If a mole suddenly increases in size, changes in color, breaks out, bleeds, or has unclear borders, it is necessary to consult a doctor in time to clarify the nature of the mole and treat it actively.