Alopecia is a chronic inflammatory disease that affects the hair follicles. It is the medical term derived from a classical Greek word that means hair loss. Autoimmune alopecia is hair loss due to the body’s immune system acting against its own tissue. The body’s immune system normally makes proteins called antibodies to protect the body against viruses, bacteria, and other foreign materials. These foreign materials are called antigens. In an autoimmune disorder such as alopecia, the immune system loses its ability to tell the difference between foreign substances ( antigens) and cells in the hair follicles. The immune system then makes antibodies directed against ’self’. This immune response causes chronic inflammation at the hair follicle.