What is a nevus and do I need to get rid of it? Is laser or surgical removal better? Usually what people call a mole is a nevus. The release of the Chinese New Year drama “Do Not Disturb II” has made some viewers start to talk about “moles”. In the drama, Sun Honglei plays a big money Li Xiangshan, who has a black mole on his small foot, but he never cared about it, and the mole turned into a melanoma. How does a mole cause cancer? The real reason why a mole evolves into a malignant melanoma is still unclear, and trauma or various external stimuli (such as chronic friction) are often regarded as causative factors. If a mole grows, how should it be treated? Principles of mole removal: 1.Surgical excision is preferred. If laser mole spotting does not reach the effective depth, the mole will recur. 2.Moles that can be spotted cleanly at one time cannot be repeated many times, which will increase the risk of mole cancer. What kind of moles should be given high attention and timely consultation at the hospital? Dermatologists have an ABCDE principle: ASYMMETRY asymmetry, BODER unclear edge, COLOR uneven color, DIAMETER diameter >6mm, palmoplantar diameter >3mm, EVOLUTION changing, size, shape, color, etc. The following kinds of moles should be removed early: 1. moles on mucous membranes: such as oral mucosa, conjunctiva, vagina, foreskin flap, etc. conjunctiva, vagina, and the part of the foreskin that is turned out. 2. Moles stimulated by long-term friction: such as moles that grow on the waist of bras and pants. 3.Moles on the limbs: Because moles in this area have a higher chance of becoming malignant melanoma than moles in other places.