I have growing bald spots and no one knows why

[ollylolly101]

BACKGROUND:
I have had nervous ticks my entire life. A few years ago I started to rub my scalp to the point where hair would fall out. Since then, my head has been riddled with round bald spots. The thing is, I am unaware of when I start rubbing my scalp. I believe that I am subconsciously satisfied by the prickly/ sharp feeling of the hair on my finger tips. I immediately notice the bald spots when there is an inconsistency in the "prickly/ sharp feeling", so I stop touching my head. This is very important because I KNOW FOR A FACT that I AM NOT rubbing the bald spots to the point where they keep expanding.  
Before this year, I would find a spot and stop touching that area all together. Eventually the hair would grow back and all was good... Until now:
I had found a bald spot about a cm in diameter two months ago. When I am touching my head, I immediately notice when my fingers brush past this spot, so I KNOW I'M NOT RUBBING IT (Remember: The slightest inconsistency will immediately draw my attention and make me aware of the fact that i'm touching my head, so i'll stop right away).

THE PROBLEM:
The spot that was 1 cm two months ago is now almost 8 cm!!! I have no idea why it is expanding, I have never had a spot this large in my life! The spot is totally bare with a ring of stubble. For a while I thought this stubble was new growth, but with time I realized that it is breakage that will eventually fall out. It is still expanding and I have no idea what to do. I have seen 4 doctors and they all think that I am rubbing it without knowing. I try to explain how I know that this is not the case, but they have all disregarded it. I don't know what to do anymore.
I know I rub my scalp because I am stressed, but the fact that the hair is now falling out on its own scares the daylights out of me.
Could you please share your thoughts/ opinions? I need as much input as I can get! Thank you.

Also, I do not take any medication and i'm in my early 20s

[Paxiled]

Hair is like anything else -- it can get stressed.  Your hair is dead, but the live portion is under the scalp where the follicle is.  If follicles get blocked, hair gets damaged.  I've never heard of rubbing doing this, but I suppose anything is possible.  Have you used any creams especially containing petroleum products when you've irritated your scalp by your compulsive rubbing?  These can block your pores and prevent necessary lubrication and nutrients from getting to your follicles.  Diet can also cause problems.  And, you might just be going bald -- people do, you know.

[Paxiled]

By the way, something you can try, if you can stop yourself from rubbing and aren't using substances that block pores is a pretty good supplement made by Nature's Plus called Ultra Hair -- that will help if you have some nutrient deficiencies.  An herb called fo ti (or shen min, same thing, different name) can also help nourish damaged follicles and sometimes hair will grow back.  Worth a try.  But again, you might just be suffering natural hair loss due to your genetic heritage or too much testosterone or the other reasons people go bald.

[AnxiousNoMore]

You can't rub or pull your hair out by the roots, because the roots are deep and it breaks near the skin and the roots just grow your hair back. Your self diagnosed causes of the hair loss are incorrect.

See your doctor if concerned that you have a skin disease or condition causing baldness.

[AnxiousNoMore]

I reread your post and see that you have seen 4 doctors. Nothing else for me to say.