What are skin tumors? Skin tumors are new organisms that occur in the skin or subcutaneous tissues, and are classified as benign or malignant. Besides affecting the beauty, skin malignant tumors can also proliferate, cause spread and metastasis, and threaten life. Signs of skin tumor malignancy 1. sudden enlargement, color deepening or unevenness; 2. sudden rupture, erosion, ulceration, bleeding, oozing; 3. sudden pain and itching; 4. small satellite foci appearing around; if any of the above conditions, please consult the hospital. 4. Radiotherapy or chemotherapy: for partial malignant tumors or cases with spread and metastasis;