There are some common reasons for sparse or missing eyebrows. Over tweezing and over waxing the right eyebrows hair, and basically damaging the hair follicles to the point that eyebrows hair stops growing in fully.
There are also several medical reasons for eyebrows hair loss, including conditions as:
The underlying cause of eyebrow loss, age, and other factors may play a role in determining how long it takes for your eyebrows to grow back.
Do Eyebrows Grow Back?
Some people believe that when eyebrows were lost, they wouldn’t grow back. Although, unless you have an underlying medical condition that is causing your hair loss, your eyebrows should grow back usually within four to six months.
The three phases of hair growth include:
Eyebrows grow slower than scalp hair and have a much shorter active growing phase.