Papillomatosis
This occurs with the surface projection of the dermal papillae high up towards the skin surface with resultant irregular undulation of the epidermal surface and often overlying hyperkeratosis. It is commonly seen with warts, solar keratosis, epidermal nevi and some seborrhoeic keratoses. It is a major feature of a verrucous carcinoma..
Other rarer disorders to consider
Acanthosis nigricans
Nevus sebaceous
Syringocystadenoma papilliferum
Tuberculosis verrucosa cutis
