Picture of Squamous Cell Carcinoma (Calf)
Squamous cell carcinoma in situ: Bowen's disease. A large, sharply demarcated, scaly, erythematous plaque simulating a psoriatic lesion on the calf.
Image Source: Fitzpatrick's Color Atlas & Synopsis of Clinical Dermatology
Klaus Wolff, Richard Allen Johnson, Dick Suurmond
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Text: WebMD Medical Reference