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The dermoscopic progression of invasive squamous cell carcinoma. (A) Keratin clods surrounded by white circles, linear irregular vessels heading to the center of the tumor, and pinkish white background are typical characteristics of a highly differentiated squamous cell carcinoma. (B) Pronounced ulceration with diffusely arranged polymorphous vessels and prevalent red coloration are dermoscopic criteria for a poorly differentiated squamous cell carcinoma.
