Warm autoimmune hemolytic anemia is the most common form of autoimmune hemolytic anemia (see this term) defined by the presence of warm autoantibodies against red blood cells (autoantibodies that are active at temperatures between 37-40°C).

Purpura (from Latin: purpura, meaning \"purple\") is the appearance of red or purple discolorations on the skin that do not blanch on applying pressure. They are caused by bleeding underneath the skin. This term refers to an abnormally increased susceptibility to developing purpura. Purpura are larger than petechiae.