Description: well-demarcated partly translucent tumor with central crust. There are small blood vessels on the surface.

Differential diagnosis: 

* basal cell carcinoma: the translucent material and the small blood vessels are characteristic of the diagnosis.

* keratoacanthoma: because of the central crust this may be added to the differential diagnosis. The slow growth and the translucent aspect of the tumor in the picture pleads against the diagnosis keratoacanthoma.

Diagnosis: nodular basal cell carcinoma (also: rodent ulcer)

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