Hair loss, commonly known as alopecia, is a common problem that can be distressing. This is due to the problem usually result in major impact on patient’s quality of life. Therefore, in order to develop an effective treatment for hair loss, it is important to understand various forms of alopecia and the basic yet fundamental science behind it. The ongoing research on alopecia provides important information about abundant stem cell populations, impaired hair cycle and hair follicles and pathophysiology of alopecia. As a result we will better understand the basic science behind this condition [1, 2].