(Concern) Alopecia Areata

It's not about my story, but about my mother's story. She experiences alopecia areata periodically. The cause is not particularly known, and she doesn't seem to be under significant stress, but since it occurs regularly, she feels more stressed about the alopecia areata. Every time she develops alopecia areata, she receives injections at the dermatology clinic, but I worry about potential side effects. What are the treatment options for alopecia areata? I hope she recovers quickly.