Classification

 benign epidermal tumors

• epidermal hamartoma (epidermal nevus)
• seborrheic keratosis
• epithelial polyp
• clear cell acanthoma
• keratoacanthoma
• warty dyskeratoma
• verrucae

 precancerous epidermal lesions

• actinic keratosis

 maligant epidermal tumors

• cutaneous squamous cell carcinoma
• cutaneous basal cell carcinoma

References

 Owens DM, Watt FM. Contribution of stem cells and differentiated cells to epidermal tumours. Nat Rev Cancer. 2003 Jun;3(6):444-51. PMID: #12778134#

 Perez-Losada J, Balmain A. Stem-cell hierarchy in skin cancer. Nat Rev Cancer. 2003 Jun;3(6):434-43. PMID: #12778133#