Granuloma pyogenicum (pyogenic granuloma) Rapidly growing, bluish-black, soft, slightly bleeding tumour. Remark: the black colour was caused by thrombosis in the tumour parenchyma.
Acne vulgaris (overview): recurrent, multiple, disseminated standing retention cysts of 0.3-1.2 cm size on the back of a 38-year-old mansince adolescence; multiple black comedones (blackheads) are also present.
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