Skin cancer is a collective term for malignant tumors that occur in exposed parts of the body, and the common ones include carcinoma in situ (i.e. intraepithelial tumor), squamous cell carcinoma, basal cell carcinoma, etc. Experts say that skin cancer is a malignant tumor that can be easily cured, but the key is whether it can be detected and treated early. The earlier the skin cancer is treated, the better the effect. In the early stage of skin cancer, the symptoms are not obvious and often painless, so patients often ignore it or deal with it at home because they are afraid of trouble or money. In the case of squamous cell carcinoma which grows faster, has higher malignancy and is prone to metastasis, huge ulcers may appear on the face, and it is too late to seek medical treatment at that time. The earlier the treatment of skin cancer, the better, and it is better for patients to seek early diagnosis and treatment. At present, besides surgery, there are also drug therapy, cryotherapy, radiation, chemotherapy, laser and immunotherapy, all of which have good efficacy and the cure rate can be over 90%. Like human organs, delayed treatment and recurrence of skin diseases can increase the possibility of cancer. Therefore, sudden increase of moles, deepening of color, oozing, ulceration, hair loss, bleeding, or sudden appearance of lumps and pigmentation on the skin may be signs of skin cancer and should be promptly sought for medical treatment. Although Caucasians have a higher chance of skin cancer, we should know enough about skin cancer and what are the measures to prevent skin cancer so that we can reduce our own disease rate through effective prevention in daily life.