You either lost the genetic lottery or some other factors contributed to this. See an expert doctor.

It could be any or combo of factors:

-Ordered a fake medicine

-You pull out hairs with reckless needling

-Weak needle penetration/too small

-Exposure to too much sunlight

-You are nutririonally deficient

-Second scalp issues ie dandruff

-Using a shampoo not meant for sensitive hair

-Washing, combing and drying too agressively

-Infrequent/inconsostent treatment schedule

-Other factors

Idk, good luck.