A Boy exposed to the Nagasaki atomic bomb showed typical keloid scars similar to many burn patients. Initially, we found keloid scars in 67% of burn patients and 21% of trauma patients. Surgical excision of the keloids resulted in recurrence in the majority of cases.

　　Boys exposed to the Nagasaki atomic bomb showed typical keloid scars similar to those of many burn victims.

　A survey of the surgical sequelae of Nagasaki atomic bomb survivors seven years after the bombing was conducted by the Nagasaki University School of Medicine (Chouraisuke) in August 1946, September 1947, and January 1949, a total of three times. Initially, 67% of burn patients and 21% of trauma patients were found to have keloids in their scars. Moreover, even after surgical removal of the keloids, the majority of the keloids recurred.

　The third survey in January 1949 confirmed that the keloids tended to heal spontaneously over time and that the number of recurrences after surgery had decreased markedly. In 1952, seven full years after the Nagasaki atomic bombing, the status of atomic bomb keloids, the course of burns and trauma received from the atomic bomb, and the course of surgical treatment of motor disability of the limbs were observed. There were only 290 patients in total, 123 males and 167 females, with sequelae. Burns were the most common type of injury at the time of injury, followed by vitreous wounds, and fractures and dislocations were rare. Dislocations of the wrist and knee joints, which are characteristic of atomic bombings, were observed.

　The sequelae of the injuries were hypertrophic scars, but keloids were very rare, and most of the scars were ordinary simple simple scars. Contractures were mostly due to hypertrophic scarring, and the rest were due to fractures and dislocations. Nerve palsy is due to dissection of the nerve trunk caused by a piece of glass, and ulnar nerve palsy is the most common cause of palsy. The deformities of the ear shell were caused by chondritis due to suppuration of facial burns, resulting in deformity of the ear.

　Most of the keloids from atomic-bomb burns were transformed into simple or thickened scars, and only 6.3% of burns and 0.9% of traumatic injuries had small keloids on a part of the limbus. Furthermore, 3 out of 12 cases (2 burns and 1 trauma) were congenital keloids that were caused by moxibustion scars or insect bite scars. All other keloids caused by the atomic bomb tended to heal completely spontaneously, with the exception of those with congenital conditions.