The phrase floating rib (Latin: costae fluctuantes) refers to the two lowermost, the eleventh and twelfth rib pairs; so-called because they are attached only to the vertebrae–and not to the sternum or cartilage of the sternum.
Inspiration: natural process of drawing air into the lungs.
Answer:
Have you considered duck tape? If you leave it on long enough it creates the same effect, just you know without blood. You don't have to answer this, but are you using cutting as a kind of outlet? Or for different reasons such as self hate? If you also don't mind me asking, do you cut daily?
It's definitely letter A. Mononucleosis