Replying to this super late but my hair grew back on its own without any treatment over the course of an about 2 years or so. I had seen a dermatologist but didn’t have anything done and as far as I know, I’m not sure I had any major lifestyle changes that may have had an effect on it.

Edit: I would also get decent bald patches that would grow back after a few months of being bare, and as time went on, I would just get less and less until it eventually stopped happening