Gibbosity

Definition: (from dictionary.com)
-noun
1. the state of being gibbous
2. a protuberance or swelling

Examples:
"The gibbosity on my face is too big to be covered by foundation; I can't go to prom looking like this!"
"Don't overreact, it's just a pimple. But just in case it doesn't go away, I'll find you a mask to cover that gibbosity."

Origin: (from etymonline.com)
"c.1400, 'bulging, convex,' from Late Latin gibbus 'hunchbacked,' from Latin gibbus 'hump, hunch,' of uncertain origin. Of the moon from early 15c.; also used from 15c. of hunchbacks."

Awkwardness rating: 6

I can't go to prom with a gibbosity on my face! (beautyoholic.blogspot.com)