The bruising on female thighs can be caused by external stimulation, thrombocytopenia, simple purpura, renal lesions, coagulation dysfunction, etc.: 1. External stimulation: the patient’s thighs are stimulated by bump, squeeze, trauma, etc., which leads to the rupture of subcutaneous capillaries in the thighs and then bruising. Patients can apply local heat to promote bruising absorption or dissipation; 2, thrombocytopenia: patients with abnormal reduction of platelets in the body, can appear bruising, bruising, etc., may be due to viral infection, drug stimulation, autoimmune diseases and other reasons, the clinical most glucocorticoid treatment, but also the application of adrenal hormone, gammaglobulin and other treatment, if necessary, splenectomy; 3. Simple purpura: is a bleeding disease of unknown etiology, the clinical manifestation is skin purpura or bruises, mainly spontaneous appearance. The main reason for this is that it is not a good idea to take a look at the skin. If the symptoms are serious, vitamin C can be taken to reduce subcutaneous bleeding; 4. Kidney lesions: in the case of long-term kidney lesions, the skin will appear bruised, and some other symptoms mainly include hematuria, proteinuria, edema, hypertension and many other abnormal symptoms. The primary disease needs to be treated in order to improve the symptoms of bruising; 5. Coagulation dysfunction: It is a bleeding disorder, which is caused by the lack or abnormal function of coagulation factors, typically manifesting as bleeding from the skin and mucous membranes, and in severe cases, hematuria. It often requires supplementation of coagulation factors and usual rest. If there is a primary disease, the cause needs to be clarified and treated accordingly.