Here is an article about heat damage.
Bubble hair
Bubbles formed within hair as a result of water boiling within the cortex
This one finally burst, I take it (my commentary...not theirs)
Except #1
We have seen the importance of the moisture content of hair to the hair's condition. Processes like blow drying reduce the moisture content below its normal level and can in themselves be harmful. Hair dryers and other heated appliances first soften the keratin of the hair. If they are too hot, they can actually cause the water in the hair to boil, and tiny bubbles of steam then form inside the softened hair shaft. The hair is thereby weakened, and may break altogether.
There is no treatment for seriously heat-damaged hair, although trimming the damaged hair can reduce the formation of split ends.
Exerpt #2
People will tell you that their bubble hair 'just happened', quite suddenly, after they had been doing the same things to their hair for a long time. Then all at once they noticed tiny 'bubbles' in the ends of their hair.
Invariably, bubble hair is caused by some kind of heating appliance, most often curling irons. These operate somewhere between 120 and 180 °C, roughly speaking. Water boils at 100 °C. If a hot curling iron is put on to wet hair, it boils the water inside the hair. The boiling water softens the keratin of the cortex; then the steam from the boiling water expands and forms tiny bubbles inside the hair. Eventually the hair breaks off, either at or somewhere near a bubble.
Every woman who has used curling irons knows that they work better on some days than others. One day she may have them just a little hotter than usual: that might be just enough to cause bubble hair, and for the affected hair to break off.
Although the sufferer usually claims that her hair was perfectly normal until she changed the hair product she was using, further enquiry always uncovers a history of increased or excessive cosmetic treatments. Usually bubble hair happens to people who are doing a lot of styling to their hair at home. And it is always, always associated with the use of heated appliances on damp hair.
The Life Cyle of Damaged Hair
Usually hair damage takes place gradually, stage by stage, as follows:
*The hair is weakened
*The cuticle begins to break down
*The cuticle disappears, layer by layer
*The cortex is exposed
*Split ends appear
*The hair breaks.
I used a blow dryer, hot comb, and flat iron this past weekend. I haven't washed my hair yet because I'm worried I might have heat damage as well. 
That's why I'm scared to straighten my own hair.
I really love your coils CG. I feel you though...I sustained a small patch of straight ends on the left side of my head when my stylist straightened my hair in May with marcels. I just assumed that part got missed with the heat protectant. I just ignore it and try to blend it in. Eventually I may cut it off but for now I just live with it. So I just say roll with it until you are ready to chop off those damaged ends. 
Some of the pieces are still striaght. It appears I can notice it easily whereas my other people look at me like I am strange when I bring it up. In order to get it to look straight, a hot comb works best. I think the Marcel curling iron is the culprit. I have washed it and deep conditioned my hair but it has not come back. I just splend it in with the rest of my hair. 
