Itchy skin is a sensation that arises as a result of irritation by mechanical or chemical stimuli to the nerve endings present in the dermis. There are many causes of itchy skin. They can come from the internal or external environment. They may be caused by an improper diet, allergic reaction, skin irritation or improper skin hygiene. Unfortunately, it can also be a symptom of various neurological, cardiac, venereal or dermatological diseases.