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File:Histopathology of seborrheic keratosis.jpg|'''[[Seborrheic keratosis]]''': Acanthosis, absence of atypia, pseudo-horn cysts, in inflamed lesions, mitoses may be present.
File:High-magnification micrograph of oral bowenoid papulosis.jpg|'''Bowenoid papulosis''': Atypical keratinocytes and mitoses. Histology similar to Bowen’s disease.
File:Melanoma resembling a squamous cell carcinoma.jpg|A '''[[melanoma]]''' may have relatively plentiful eosinophilic cytoplasm, and be seemingly continuous with the squamous epithelium (at left in image), thus resembling a squamous cell carcinoma. However, the nesting of cells at right in the image is more characteristic of a melanoma.
File:Micrograph of squamous cell carcinoma metastasis to the skin.jpg|'''Metastasis''': Personal medical history of the patient, nodular proliferation without connection to epidermis, immunohistochemical evaluation. Squamous-cell carcinoma metastasis from lungs to the skin is pictured.
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