The common causes of lateral thigh bulge are as follows: First, local lipoma, mostly seen in the abnormal accumulation of adipose tissue on the lateral thigh, forming local mass-like changes, the nature of the lesion can be clarified through ultrasound examination, and for larger lipomas, accompanied by obvious pressure pain symptoms, surgical removal can be considered to improve the patient’s pain symptoms; Second, the lateral thigh can form a local hematoma after a fall or impact by external forces, manifesting as a swollen mass, the patient can be given a local ice pack for twenty-four hours to help reduce tissue exudation, and after twenty-four hours, a local hot pack is used to promote the dissipation and absorption of the hematoma.