Keloid scar, it is dangerous to have it and make no treatment to it? can it become larger?

No/Yes: It is not dangerous to have a keloid scar, and no treatment will not lead to harm. Keloids can grow larger, although they usually do so in response to some trauma, like attempting to remove it.

Not dangerous: Keloid scars can be painful, "itchy, " and disfiguring but not dangerous. They usually grow slowly. As long as they are "red" and "itchy" they are "active" and are likely to enlarge.