Can Alopecia Come Back?

When i was 12 my mother began to notice a bald spot on the crown part of my head. The bald spot got bigger and i went to see a dermatologist, who said it was mostly due to yanking of my hair, which then i began getting shots in my scalp. I lost quite a bit of hair but i regained it all by the time i was 13 or 14. Now i am 19 and I'm noticing my hair is thinning and I'm horrified to even think that it is coming back, even though i never allow my hair to be pulled on, so can it come back?

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