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.
Fast Facts: An Easy-to-Read Series of Publications for the Public. Alopecia areata is a disease that affects the hair follicles, which are part of the skin from which hairs grow. In most cases, hair falls out in small, round patches about the size of a quarter. Many people with the disease get only a few bare patches.Some people may lose more hair.ast Facts: An Easy-to-Read Series of Publications for the Public. Alopecia areata is a disease that affects the hair follicles, which are part of the skin from which hairs grow. In most cases, hair falls out in small, round patches about the size of a quarter. Many people with the disease get only a few bare patches.