Whether or not purpura hurts can depend on the base cause and severity of the condition. In some cases, it may not cause any pain or discomfort. For example, if the condition is caused by a minor injury, such as a bruise it may not be painful. If caused by a more serious underlying condition, such as an infection, it may be accompanied by pain or discomfort. If caused by a blood clotting disorder, it may be associated with pain and warmth in the affected area.