Part of the gum. - http://en.wikipedia.org/wiki/Gum_(anatomy)
If it is enlarged, there is probably a problem with the teeth/gums, go see your dentist.
Lipoma, sebaceous cyst, and abscess are common causes of bumps on the back under the skin. See your health care provider for a specific diagnosis in your case.
it's a spine disc
the bumps on your back is because either you have a virus or an eritation to somthing you put on your body like a new cream or somthing
grafing if its a major burn or just healing in time
it indicates the presence of an impacted tooth in th bottom of a horses mouth.
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