I think everyone has a certain spot that doesn't grow or breaks more. I have a quarter sized area on the right side of my crown that I have to "baby" because that's where breakage begins. When I was relaxed I would have to hide it by pulling hair over it. Now I can't tell where the trouble spot really is. It's maybe a tad bit shorter than the rest of my hair, BUT it's not a bald spot anymore. It would come and go every 6 months or so. Now that I think back, it would fill in on "stretches" and then post relaxer or semi perm color it would be bald again with mucho shedding everywhere else. So I think your stress spot is just your "Achilles tendon" of hair.
however. im remaining positive. i still have length. the patch is in the back on the right and not visible. it kills me to know it's there. by the end of the year if i retain it will be about 4 1/2 inches. i can't be depressed over this. just keep my regimen simple and stop trying everything i hear about and comb every night instead of not combing and find a good moisturizer. i can't co wash. not good for my hair. and switching to a lye relaxer....im happy that im getting it together. hang in there girl. remain positive, do alot of reading up, try to find a hair twin or a hair mentor on the board and keep it simple!! i wish u lots of luck and success!! 
