There is a possibility that keloids can become cancerous and can develop into keloid cancer if the keloid is frequently infected, for example. Keloid scars are traces left after the healing of traumas (e.g. skin abrasions, etc.) and diseases (e.g. sores, etc.). Overgrowth of keloid scars, which form firm nodules or long swellings that rise above the surface of the skin, is called keloid scars. Keloid carcinoma is based on the formation of keloid or keloid, and most often occurs in unstable scar tissue, especially if the scar is ulcerated and has not healed for a long time. The length of time for malignant transformation of keloid scar varies from as short as 3 months to as long as several decades. It usually occurs in middle-aged and old people, and the average age is over 50 years old; it occurs in the lower limbs, and can also be seen in the trunk and other parts of the body; before scar cancer, it usually has a long history of chronic ulceration and itchy symptoms, and the course of the disease is slower; there is no proliferation of metastasis after scar cancer; the histological examination is mostly squamous cell carcinoma, and a few of them are basal cell carcinoma. If the scar has the above symptoms, it is recommended to go to regular hospitals in time and standardize the diagnosis and treatment, so as to avoid delaying the condition and causing serious consequences.