Bruising on the thighs in girls can be caused by trauma. This is due to blood seepage caused by the rupture of capillaries, or small veins, under the skin after the patient has suffered a traumatic injury. Blood stagnation under the skin can cause subcutaneous bruising. It is recommended that the patient can apply cold compresses to the local area, which can effectively relieve subcutaneous bleeding. Then hot compresses can effectively promote local blood circulation and accelerate the dissipation of bruises. It is also possible that the coagulation function of the patient’s body is abnormal, such as the patient’s platelet count is low or the blood five abnormalities. This situation causes blood vessels to ooze blood, resulting in bruises on the thighs. It is recommended that patients must undergo relevant examinations, such as blood tests, coagulation five or platelet count. Can be clearly diagnosed, and then after a clear diagnosis must be timely symptomatic treatment, can effectively avoid the recurrence of bruising.