The redness of the hand put down may be a normal physiological phenomenon, may also be the upper extremity vascular lesions, need to be specifically analyzed. 1. Normal physiological phenomenon: after the hand is put down, the local blood supply of the palm increases, and the phenomenon of redness of the palm can occur, which is a normal physiological phenomenon. 2. Upper extremity vascular lesions: upper extremity vascular lesions, such as vasculitis, etc., the venous valve function is impaired, blood reflux in the blood vessels is impeded, which will lead to redness of the hand, upper extremity vascular ultrasound can assist in the definitive diagnosis. The redness of the hands may be a normal physiological phenomenon, or it may be caused by vascular lesions, it is recommended to consult a doctor in time, except for organic lesions.