Scars are not more likely to become cancerous the bigger they get.
Keloid cancer is a gradual lesion that develops on the basis of scar or keloid formation in a short period of a few years or a long period of a few decades, mostly due to the itchy scars and scratching, friction that leads to scar breakage and erosion, and the formation of long-lasting ulcers and malignant changes.
Scar tissue can undergo malignant changes and become scar cancer. Cancer is most common in unstable scars. This is especially true when the scar breaks down and forms an ulcer that does not heal over time.
Keloid scars are benign growths caused by excessive proliferation and differentiation of connective tissues within the skin, and are not more likely to become cancerous the larger they get.
Keloid scars, you should actively go to the regular hospital to seek medical treatment, follow the specialized medical advice standardized treatment.