A 70-year-old man recently had a patch on his nose that was broken by his eyeglass frame, and after careful examination, the nail-sized “wart” turned out to be skin cancer. The patient has had this “wart” for several years, at first it was only the size of a sesame seed, then it grew bigger and bigger and broke down, so he came to the hospital for examination, and the doctor found that the “wart” was about the size of a fingernail, dark brown, protruding from the surface of the skin, the central part broke down, such as The doctor found that the “wart” was about the size of a fingernail, dark brown, protruding from the surface of the skin and breaking down in the center like a volcanic crater. The “wart” was found to be a basal cell carcinoma. Cryotherapy would not only fail to eradicate the wart, but might also stimulate the tissue to deteriorate and lead to malignant changes. The doctor then performed surgery to remove the tumor, which had to be expanded due to the large area involved. A sore is a small yellowish-brown bump that does not hurt or itch. Basal cell carcinoma, on the other hand, is a common malignant tumor of the skin, mostly found in middle-aged and elderly people over 40 years old, mostly on the nose, followed by the cheeks. Excessive sun exposure, exposure to chemical carcinogens, as well as long-term exposure to radiation and mechanical injury may lead to the occurrence of basal cell carcinoma. It is often misdiagnosed because it is painless and its appearance is extremely similar to that of a wart or a wart. Since this tumor will gradually grow and invade the surrounding tissues, it may lead to an increase in excisional area once delayed for too long, and affect the facial aesthetics. There are many cases of elderly patients who ignore the skin nodules and do not come to the clinic in time, resulting in the increase of skin lesion area. Basal cell carcinoma mostly occurs in the face of elderly people, so elderly people should pay attention to the nodules and plaques protruding from the skin surface, observe them regularly, and seek medical treatment in time if they are found to be increasing in size. In addition, when treating, pathological examination should be conducted in regular dermatological institutions to clarify the nature, so as not to aggravate the disease by using superficial treatments such as freezing and laser.