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.
Alopecia areata is an autoimmune disease. Normally the immune system protects the body against infection and disease. In an autoimmune disease, the bodyâs immune system mistakenly attacks some part of your own body.In alopecia areata, the immune system attacks the hair follicles.The cause is not known. Scientists think that a personâs genes may play a role.For people whose genes put them at risk for the disease, some type of trigger starts the attack on the hair follicles.n alopecia areata, the immune system attacks the hair follicles. The cause is not known. Scientists think that a personâs genes may play a role. For people whose genes put them at risk for the disease, some type of trigger starts the attack on the hair follicles.