Skin pruritus is the primary damage on the skin, just itching skin. Sometimes secondary damage due to scratching. Systemic and limitations according to the itching parts and the range is divided into two categories. 
 The itching is the most common symptom of skin disease, caused by many reasons for itching, generally caused by internal and external factors. 
 The internal factors include the number of skin diseases, certain system diseases, neurological factors and endocrine factors. 
 The external factors include the physical, chemical and biological factors. 
 Skin pruritus often associated with diabetes, gallbladder disease, chronic renal failure, blood diseases, neurasthenia. 
 Skin rather music experts pointed out, may have the following causes: 
 Systemic pruritus and certain systemic diseases such as diabetes, primary biliary cirrhosis, chronic renal failure, iron deficiency anemia, thyroid disease, lymphoma, visceral malignancies, parasites, such as AIDS. Irregular menstruation, pregnancy, temperature, said light, alcohol and chemical, biological stimulation and phenothiazine, opiates, synthetic hormones and other drugs can also cause itchy skin. 
 Localized skin itching is often associated with tight underwear, hemorrhoids, vaginal candidiasis, trichomoniasis, contact sanitary napkins. 
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