I have a patch with no hair on the side of my head an am only 26 Female- Causes? Solutions?

Hi. I am a 26 year old female who has a pretty large patch of no hair on the side of her head. I don’t know if its getting progressively worse, however my hair is not really falling it just seems not to be growing. I don’t see any abnormal hair loss when I comb my hair. I had no hair in this spot as a teenager and assumed it was because of chemical hair products, I stopped that 10 years ago and no hair has yet to grow. Also, I’m afraid that its getting worse. I tried no to pay attention to it for years assuming that it would grow back but no. I can cover 80% of the spot with hair from other sides of my head by combing it in a certain direction but at 26 I fear to be loosing hair from this side without noticing.

Also, I have other little patches of no hair growth on the front of my head- nothing major – its been there since I was a teen also but now that after all these years it has not filled of I’m afraid.

The rest of my head- the back 4/5th or so is fine- with more than enough hair to cover my whole scalp and for a ponytail that is just right- not as thick as I would like but not thin.

Does anyone know what could have caused such to happen and what could prevent such from growing?

Also, if seeking professional help would I see a dermatologist or a MD or other specialist?

Does anyone know what could possibly be causing or have caused such and what I can do in regards.

I would greatly appreciate any input.

XOXO