thinning above hair and temple left side only?

[zomboy93]

I'm slightly thinning one side of my head above my ears, I can feel destiny difference in comparison to the other side. My hair is brown and where it is thinning it appears to be much lighter.
Scalp is slightly inflamed, it's sensitive when push my hair the opposite direction. My hair has been like this for a few months now , seeing a derm and getting blood work done soon.
What are the possibilities? could it be an thyroid problem?
If I look closely some of my scalp on the same side has some almost invisible pale pinkness, only in certain parts most of it is normal white color.
I been on Propecia 1mg for one year and a half and have maintained my hair at Norwood 1 I jumped on it on the first signs of thinning I was probably 1.5 on the scale.

[zomboy93]

Will upload pictures soon so you guys can let me know what you think!

[zomboy93]

My hair is around grade 1 or 2 here, now I have grown it out it's not as noticeable but you can still see it's slightly different compare to the rest of my hair and it feels thinner.