Dermatoscopy of facial actinic keratosis, intraepidermal carcinoma, and invasive squamous cell carcinoma: a progression model.

Background: Little is known about the dermoscopic features of keratinocyte skin cancer.

Objective: We sought to determine the dermoscopic features of facial actinic keratosis (AK), intraepidermal carcinoma (IEC), moderately to poorly differentiated invasive squamous cell carcinoma (SCC), and well-differentiated SCC of the keratoacanthoma type.

Methods: This was a retrospective analysis of dermoscopic images of histopathologically diagnosed keratinocyte skin cancer.