July 2016

Keratoacanthoma is a common, rapidly growing squamoproliferative tumour that may spontaneously regress. It is histologically indistinguishable from (and likely a

Junctional, compound, and dermal naevi are benign localized neoplastic proliferations of naevus cells (a type of melanocyte). Like all melanocytic

Lichen planus—like keratosis is a benign squamoproliferative lesion showing chronic inflammation and interface changes (likely representing active regression).

Actinic keratosis (AK) is an intraepithelial neoplastic lesion that may progress into invasive squamous cell carcinoma (SCC) or may spontaneously

Dermatofibroma (fibrous histiocytoma) is a common benign papular or nodular skin lesion composed of variable combinations of fibroblastic cells, macrophages,

Cutaneous squamous cell carcinoma (SCC) is a malignancy of epidermal keratinocytes that exhibits various degrees of differentiation that partially recapitulate