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Keratoacanthoma, light micrograph

Keratoacanthoma, light micrograph

C006/5959

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Credit

BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY

Caption

Keratoacanthoma. Light micrograph of a section through a keratoacanthoma nodule. The surface layers are across top, including the hard keratin layer. Below this there are patches of inflammation and white blood cells with stained nuclei (dark spots). The cause of a keratoacanthoma lesion is unknown but it has many features of a viral condition, and consists of a localised proliferation of squamous cells that forms a cratered nodule. The nodule grows over several weeks before gradually disappearing. However, the unsightly nodule is often surgically removed. The cause of keratoacanthoma is unknown, although exposure to sunlight appears to be a factor.

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