There are several reasons why skin can become severely itchy including dry skin, nerve disorders, allergic reactions, taking certain drugs and pregnancy. Irritation to certain fabrics or cosmetics can also be a factor reports Mayo Clinic.
During colder months skin dries out, which may lead to skin becoming itchy. To remedy this, WebMD.com recommends using a moisturizer up to several times a day, applying a lip balm, sun screen during day and using a humidifier at night may reduce the severity. For those who are itchy from sweat, WebMD.com recommends using a mild soap only on sweat prone areas, such as underarms, groin and feet.