Darker, Coaurse hair. Damaged Scalp

18/Male/UK

Hello,
Over the past year or so i have been noticing darker, coarse hair appear. It it wiry and curly. I have light/medium brown hair and i am always noticing these hairs and have been pulling or cutting them out. For over a year i have though that it was caused by using hair straighteners. I assumed they were burning parts of the hair, so i used straighteners less often. Lately my scalp has started itching, especially in heat, and the darker hairs are more frequent. After a little research on the internet i realised that it is not to do with straightening!
I am quite worried as i don't want to find out that my scalp is permenantly damaged as i will have problems for life! I have booked an appoitment at the doctors so i can see a dermatologist.
Until then, i was wondering if anyone can give me some more advice and help regarding the problem as i am hoping that i will be able to sort it out through medication.

Thank you.
Andrew