Chicken skin on the legs is usually divided into physiological and pathological, physiological chicken skin and emotional excitement, cold weather and other physiological factors, pathological chicken skin is generally known as medical keratosis pilaris. 1. Physiological factors: if the mood is particularly excited or the weather is cold, the local skin may appear chicken skin, do not need special treatment. 2. Perifollicular keratosis: its etiology may be related to genetics, vitamin A deficiency and metabolic disorders, etc. Patients will have localized normal skin color or reddish pimples with a chicken skin-like appearance, which are mostly found on the buttocks, upper limbs and thighs extensor and other places. There are many causes of chicken skin on the legs, and after eliminating physiological factors, patients are advised to consult a doctor about the matter.