Itchy skin without any symptoms, consider and dry skin, mental illness, allergy symptoms, pruritus and other factors. 1. Dry skin: the human skin will be affected by the season and diet, in the fall and winter dry season, such as patients with low water intake, it is likely to produce itchy skin symptoms due to dry skin, but not accompanied by any other symptoms. 2. Mental illness: some patients may have symptoms of itchy skin due to emotional tension and anxiety, which is not accompanied by other symptoms. 3. Allergy symptoms: allergic people, in contact with allergens may produce itchy skin symptoms, which belongs to the allergic reaction, the symptoms are mild, not accompanied by any other symptoms. 4. Pruritus: itchy skin without any symptoms, consider and typical pruritis factors, this is the itchy skin symptoms without primary lesions of the disease, the patient may also have a burning sensation, ants crawling sensation and other symptoms. It is recommended that patients can go to the dermatology department of the hospital, cooperate with the doctor to clarify the specific causes, and then do the appropriate treatment and therapy.