A desert is a region of land that is very dry because it receives low amounts of precipitation (usually in the form of rain but may be snow, mist or fog), often has little coverage by plants, and in which streams dry up unless they are supplied by water from outside the area.
Alopecia areata is an autoimmune disease. Autoimmune means that the body's immune system attacks the body. When alopecia areata develops, the body attacks its own hair follicles. A person's genetic makeup, combined with other factors, triggers this form of hair loss.
In rare cases, some people may experience more extensive hair loss. This is usually an indication of another type of alopecia, such as: alopecia totalis, which is the loss of all hair on the scalp; alopecia universalis, which is the loss of all hair on the entire body; The hair loss associated with alopecia areata is unpredictable and random.