_____ is a serious form of skin cancer that often ulcerates, forms a crust, and has a tendency to metastasize if allowed to reach an advanced stage.

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SCC lesions often present as a crusted or scaly area with a red, inflamed base; as a growing tumor; as a nonhealing ulcer; or as a raised, firm papule (see Figure 6-35). Hyperkeratosis is an important feature that distinguishes SCC from BCC. The ulcerated lesions may be painful.

_____ Is a Serious Form of Skin Cancer That Often