Body surface tumors are generally divided into benign and malignant, among which benign ones account for the majority, such as lipoma, fibroma, neurofibroma, tendon sheath cyst, sebaceous gland cyst, and so on. The malignant ones include basal cell carcinoma, squamous epithelial cell carcinoma and malignant melanoma, etc. Commonly, body surface masses that need to be differentiated from malignant melanoma include: basal cell carcinoma, seborrheic keratosis, dysplastic nevus, blue nevus, dermatofibroma, various types of nevi, hemangioma, venous lake, pyogenic granuloma and warts. Among them, most of them are benign tumors that do not have any effect on people’s body, so there is no need to worry about them at all. Although basal cell carcinoma also belongs to malignant, compared with malignant black, the degree of malignancy is much less, and early treatment is completely curable. Then which body surface tumors need timely medical consultation? The simplest thing is to pay attention to the following points: 1. Body surface tumors in the palms of hands, feet, genitals, collar, belt and other frequently rubbed parts, because these parts are often rubbed and are prone to malignant changes, which need to be treated in time. 2.The head and neck are often exposed to sunlight, so they are also susceptible to lesions. 3.Mole spots on other parts of the body, if: firstly, the area or volume suddenly increases; secondly, the color suddenly becomes darker and blacker; thirdly, the mole suddenly bleeds and breaks; fourthly, itchy, painful and other conscious symptoms appear; fifthly, many new small black spots appear within 2 cm around the mole, like satellites around the earth, professionally called “satellite foci”. This is professionally called “satellite foci”. Once the above changes occur, you should pay attention to them and seek medical attention early: to eliminate possible malignant changes in the bud, so as not to delay the disease and leave regrets.