Li L, Yuan C, Zhang X, et al. - Researchers conducted the study for identifying clinical characteristics and risk factors of superficial X-ray-induced hyperpigmentation in postoperative keloid radiotherapy. Seventy keloids in 55 patients were treated with superficial X-ray after surgery from November 2019 to November 2020. Patient data and treatment-related parameters were obtained. The pigmentation was a well-defined rectangular brown macule consistent with the unprotected area involving normal skin, and 82.9% of keloids exhibited pigmentation induced by superficial X-ray one month after treatment. In postoperative keloid radiotherapy, superficial X-ray-induced hyperpigmentation was common and severe. The location and length of the keloid incision can predict the occurrence and severity of pigmentation.