Alopecia is a common autoimmune disorder that usually results in unpredictable hair loss. An autoimmune disorder is a condition in which your immune system mistakenly attacks your body. In the majority of cases suffering from alopecia, hair falls out in small patches. Sometimes, it can lead to the complete loss of hair on the scalp and even the entire body.
The condition of alopecia can affect anyone regardless of age and gender, though in most cases it happens to attack before the age of 30.