Dear Mrs Quinn,
by the sound of your descrition it is Alopecia Areata, this is an auto immune condition .Auto immune means the body attacking itself this can be bought on by stress or possibly puberty.The follicles are dormant so may or may not recover. Small patches usually have a good prognosis and do recover! But this condition is difficult to give a defining prognosis. If the patch is in the hair line then it will be traction Alopecia from puling the hair tight so this should grow back once you stop pulling the hair so tight ...More >
.I hope this helps , for further advice on Alopecia contact Alopecia Uk.