First, it should be clear that, with a few exceptions, the body achieves wound healing in the form of scarring in cases where the injury involves deeper layers of skin. In other words, deeper wounds will leave scars. If you look at a long wound, you will see that the skin at the wound is different from the surrounding area, which is the scar. Some of them are not obvious and can be called normal scars; some are obvious, red, raised, painful and itchy for a long time, and even invade the normal skin like a tumor, and these can be called abnormal scars. And the so-called keloid refers to patients who are more prone to abnormal scarring than normal people after injury. Individual differences in susceptibility to abnormal scarring do exist. For example, keloid scars in people of color are usually more likely to develop abnormal keloid scars than in whites. So how can you tell if you have a keloid? Currently, it is not possible to determine this through genetic testing because the cause of abnormal scarring is not well understood. Clinically, it is usually determined by looking at the prognosis of a patient’s previous wound scar. For example, if the previous wound scar is red, raised, painful and itchy, lasts for a long time and fades slowly, then the development process of the scar after other parts of the injury may be similar, and we call it keloid hyperplasia; the extreme example is that the patient has a tumor-like growth of the keloid, then it is highly likely that the injury in other parts of the body will also cause the keloid. However, this is not a very accurate determination. For example, some areas of the body, such as the forehead and outer upper arms, are prone to abnormal keloid scarring, and even if the patient has no scar growths from other areas of injury, it does not predict that the above areas will not suffer from abnormal keloid scarring. Another example is that children and adolescents are more prone to scar growth than older adults, so the presence of scar growth in childhood does not predict whether abnormal scarring will grow in adulthood. For example, severe burns usually cause keloid scarring, but neat and clean sharp cuts usually do not have significant scarring, so burn patients cannot be said to have keloid even though they have keloid scarring. To sum up, the determination of keloid is complex and many factors have to be considered. Some advice based on some characteristics of keloid scars: 1. Patients with keloid scars on their body must try their best to avoid injury to other parts of the body. 2. Patients with a history of keloid scar growth, if they are going to undergo surgical procedures, they should actively carry out postoperative scar prevention treatment for the incision. 3.Patients who have undergone scar treatment with poor treatment results need to provide medical history to the doctor. 4.If the wound scar is not obvious in adulthood, patients can undergo cosmetic surgery such as double eyelid, and the scar is usually not very obvious.