<span>The answer is Leukoplakia.
When you have this condition, there is a thickened, white patches that form on
your gums, the interiors of your cheeks, the bottom of your mouth and, occasionally,
your tongue. These patches can't be scratched off. Specialists don't know what the
source of leukoplakia is but consider chronic irritation from tobacco — whether
dipped, smoked, or chewed — to be the main reason in its development. Most
leukoplakia patches are noncancerous meaning that they are benign, though some
show initial signs of cancer. Cancers on the bottom of the mouth can happen
next to areas of leukoplakia. And white areas varied in with red areas
(speckled leukoplakia) may specify the potential for cancer. </span>
The tympanic cavity is an air chamber; it contains a chain of movable bones which transmit the vibrations of the tympanic membrane across the cavity to the middle ear.
