Keratoacanthoma lesions on a patient's scalp. A keratoacanthoma lesion 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 as it is clinically indistinguishable from a squamous cell carcinoma (SCC). The cause of keratoacanthoma is unknown, although exposure to sunlight appears to be a factor.

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Photo credit: © RICHARD USATINE MD / SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: body, cancer, cancerous, carcinoma, cell, clinical, condition, dermatological, dermatology, disease, disorder, epidermal, epidermis, growth, human, inflamed, ka, keratoacanthoma, lesion, looped, malignancy, malignant, medical, medicine, nodule, person, proliferation, scc, skin, squamous, type, vessels