Redness of the neck may be caused by physiological factors or pathological factors, the former including neck compression, collar stimulation, etc., the latter including prickly heat, acute eczema, contact dermatitis, inter-rubbing rash, ray elastosis, solar dermatitis, etc.: I. Physiological factors 1. neck compression: prolonged local compression of the neck, may be due to poor blood circulation resulting in redness of the neck, it is recommended that appropriate Local massage, promote blood circulation, can relieve the symptoms of redness; 2, collar stimulation: may be due to collar friction stimulation, resulting in neck redness, it is recommended to wear low-necked clothing, while trying not to wear coarse fiber clothing. Second, the pathological factors 1, prickly heat: occur in the summer, sweating, sweat will block the sweat ducts, so that the ducts of sweat stagnation, affecting the body heat, while sweat will stimulate the surrounding tissue, in the sweat hole at the papules and other lesions, with redness, neck, elbows, inner thighs and other folds, easy to rub, which can make the neck red; 2, acute eczema: visible at the neck in large numbers of corn-sized The skin of the neck is exposed to exogenous substances, such as rough clothes, poor quality necklaces, etc., and inflammatory reactions occur in the contact area or even around it, resulting in erythema, swelling, papules and other manifestations, thus leading to redness of the neck; 4, inter-rubbing rash: is the skin of the folds due to moisture, warmth, friction, etc. When the onset of the site in the neck, can lead to red neck; 5, light elastic fibrosis: mostly seen in long-term outdoor workers, the conscious symptoms are not obvious, but the skin at the neck can be seen rough, reddish-brown or yellow-brown skin and other performance; 6, solar dermatitis: is an acute injury skin reaction caused by strong light exposure of the skin, the affected skin The affected skin is red, swollen, burning and painful, which can lead to redness of the neck; 7, other: cryptorchid dermatitis, systemic lupus erythematosus, etc., may have the phenomenon of reddening of the neck skin.