Mole and nevus are inclusive relationship, in general, nevus is a type of nevus, nevus contains a wider range. 1. Nevus: generally refers to pigmented nevus, which is a disease caused by abnormal aggregation of melanocytes in epidermis and dermis. According to the location of melanocytes, it can be divided into three basic types: mixed nevus, junctional nevus and intradermal nevus. 2. nevus: it is a generalized name for black swellings in folklore, which generally refers to pigmented nevi above the surface of the skin, mainly including intradermal nevus and mixed nevus. Because of limited knowledge, sometimes seborrheic keratosis, keratoacanthoma and other black masses are also called nevus. Moles and nevi can refer to malignant swellings. If you find black swellings on your body, you should be alert and go to the hospital in time to get a clear diagnosis and treatment.