Wiry hairs growing back?

[Ziggyz123]

So I had a huge shed accompanied by a sore scalp from November until like 3 weeks ago.. I now have calmed my INFLAMMED scalp a tad with tea tree oil shampoo, but I have like black wiry hairs growing back now along my hairline.. My hair is light brown and this is really weirding me out because I've been on finasteride for 1 year and 5 months and at the one year mark my hairline receeded with pain..

What is causing these black wiry hairs?