Squamous carcinoma in dermatology refers to a malignant tumor occurring in the skin, which often occurs on the basis of some skin diseases, such as some chronic ulcers, burn scars, chronic radiation dermatitis and long-term human papilloma virus infection, etc. It is not particularly clear what the cause is. The cause of its development is not particularly clear, but is currently believed to be related to physical and chemical factors, viral infections, certain long-term inflammatory stimuli and the body’s own immune status. For example, long-term exposure to ultraviolet radiation, long-term radiation treatment due to certain diseases, and exposure to some chemical agents such as coal tar and asphalt, as well as long-term viral infections, especially human papilloma virus, can trigger the occurrence of squamous carcinoma. In addition, some chronic ulcers and lupus erythematosus that do not heal for a long time can also become malignant. In addition, the incidence of squamous carcinoma is also higher if some immunosuppressive drugs or organ transplantation are applied for a long time.