Scalp folliculitis. In folliculatis!

I have got my hair chemically straightened at home since then I have extreme pain itching burning in my roots and uneven and pricking sensation in my roots after that I shaved my head then I found out I have small red pimples on my scalp and then I met a local dermat and he said it's scalp folliculities since then I have been continuously getting treatment but I got a slight relief in all my other symptoms except prickly sensation and uneven feeling in my roots it is not getting better with any medicine I got so scared that I searched it up on internet and it said that you have some internal damage in your roots and you have structural change in your hair and it can't be treated and then I talked with my dermat and he checked and examined my hair and said that your hair texture is completely normal there is no change and visibly also it same as earlier  so my major concern is if I do not have any structural problems why does my hair prick from roots is due inflamed root in folliculatis