If the outer thigh is numb and itchy, it may be lateral femoral dermal neuritis, lateral femoral dermal nerve is composed of the 2nd and 3rd posterior branches of the lumbar nerve, which is distributed in the skin of the anterior lateral femur, mainly seen in pressure, trauma, various infectious diseases, alcohol or drug poisoning, as well as arteriosclerosis, diabetes mellitus, obesity, abdominal tumors, or pregnancy, uterine compression and so on. There are also unclear etiology, the main manifestation is the sensory abnormalities of the anterolateral thigh, such as numbness, itching, pins and needles, burning, numbness, pain, and sensory hypersensitivity, or even sensory loss, loss of sensation, standing or walking for a long time after the symptoms may be exacerbated.