White flakes on the legs can be seen in dry skin, psoriasis or exfoliative dermatitis. 1. Dry skin: generally related to the season, such as winter is drier, the skin secretes less oil, the surface of the skin will be dry and flaky, at this time need to pay attention to moisturizing and nourishing. 2. Psoriasis: can be related to genetic, immune, environmental and other factors, commonly known as psoriasis, belongs to the chronic recurrent inflammatory diseases, the skin will initially have red dots or macules, accompanied by dry scales, scratching, such as crushed foam fly off, thus exposing the red basal surface can be itchy or burning sensation. 3. Exfoliative dermatitis: can be caused by drug allergies caused by drug rash (such as phenobarbital, allopurinol, etc.) or secondary to certain skin diseases such as eczema, psoriasis, etc., the skin can be bright red and dry, and the surface can be rapidly occurring thin scales like chaff, accompanied by a large area of shedding and then generated. In addition to white scales on the legs, there are other uncomfortable symptoms, it is recommended to consult a doctor in time, after a clear diagnosis, targeted treatment.