Traction alopecia is caused by the gradual loss of hair which is primarily the result of pulling by force.
Chronic pulling or traction can result in the recession of the hairline
This is mechanical in cause primarily due to wearing hair in very tight pony tails and braids. Hair extensions, braids or even sleeping in rollers can result in permanent loss in other areas.
It can take months and many years to become apparent that there is a problem.
This is irreversible.