Flat squamous cells form the outermost
layer of the epidermis. Squamous cell carcinoma (SCC), a.k.a. "rat-bite"
tumor, is diagnosed when these cells become abnormal and grow out of control. SCC
sometimes develops from a precancerous skin growth called an actinic keratosis. SCC
is usually seen as scaly red patches or open sores, which may crust and bleed. Characteristically
it looks elevated with a central hole. Allowed to grow,
it can be fatal.
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