. 2019 Nov 6;94(6):637–657. doi: 10.1016/j.abd.2019.10.004

Table 1.

Clinical variants of actinic keratoses and their usual manifestations.

Cutaneous horn	Conical projection, markedly hyperkeratotic, white to yellowish in color, erythematous papular base with varying degrees of infiltration⁷⁰
	Differential diagnosis with squamous cell carcinoma⁶⁸
Actinic cheilitis	Reddish and/or leukoplastic plaque with desquamation, fissures, ulcerations, and/or areas of focal hyperkeratosis on the lips (95% of the cases in the lower lips)
	Differential diagnosis with squamous cell carcinoma⁷¹
Pigmented actinic keratosis	Scaly papules or plaques, rough with brown and black color⁶⁶
	Differential diagnosis with lentigo maligna
Lichenoid actinic keratosis	Pink plaque or papule
	Usually on the upper extremities or trunk
	Differential diagnosis mainly with basal cell carcinoma⁶⁶