Partial muscle numbness in the thigh may be caused by the following reasons: 1, may be lumbar disc herniation, the presence of partial muscle numbness in the thigh often suggests the presence of a high lumbar disc herniation, resulting in stimulation of the nerve roots associated with the lumbar plexus, followed by local numbness; 2, peripheral nerve compression, stimulation, such as the lateral femoral cutaneous nerve compression stimulation of the anterior lateral thigh may have a small muscle will feel For example, when the lateral femoral cutaneous nerve is stimulated by compression, a small muscle in the anterolateral thigh may feel numb; when the femoral nerve is stimulated in this way, there may be similar symptoms in the anterolateral and medial thighs; 3, it may be caused by local injury, such as local knife cuts or soft tissue blunt contusions resulting in relatively superficial sensory nerve damage, resulting in a smaller, more limited sensory numbness; 4, local skin lesions, such as burns, frostbite or contact dermatitis, which may also produce similar symptoms.