It could be a lot of things. The most common is a benign self limited problems called an aphthous ulcer. It could also be other things, some of which are serious, so you should let a doctor look at it.
leukoplakia
well they are green and lumpy on the outside and about the size of a softball. But on the inside they are white and they peel just like a clementine(sp?).
"Have you seen a lone white hair on your cheek?"
Adipose..which is fat.
it is white and lumpy thats what she said
Leukoplakia are white spots or patches that develop on the tongue or the inside of the cheek. Many people are affected by these white spots and they can easily be treated by your primary care physician.
The lumpy white clouds are called, Cumulus. Cumulus clouds are found in the lower section of the sky. They are often described as puffy or lumpy, they generally have flat bases. Cumulus clouds are generally less than 6,500 ft. Cumulus clouds may appear by themselves in a line or in clusters.
thrush
eat more green vegies like brocoli and spinach Perhaps your answer would have more validity if you used correct spelling.
Koplik's spots are tiny spots occurring inside the mouth, especially on the inside of the cheek. These spots consist of minuscule white dots (like grains of salt or sand) set onto a reddened bump. Unique to measles.
A human cheek cell typically contains squamous epithelial cells that line the inside of the mouth. These cells are flat and provide protection to the underlying tissues. Additionally, there may be some white blood cells present in the cheek cell sample.
Clouds that resemble lumpy sheets are likely altocumulus clouds. These clouds are mid-level clouds that often appear as rolls or bands of clouds with a lumpy or wavy texture. Altocumulus clouds are typically white or gray and can indicate approaching weather changes.