 Cells display pagetoid growth when they invade the upper epidermis from below.Squamous cell carcinoma, melanoma in situ, Pagetoid [[Bowen's disease], ocular sebaceous carcinoma and other [[carcinoma]]s can all display pagetoid growth.The term Pagetoid (Paget-like) is derived from the [[Extramammary Paget's disease]], wherein the large tumour cells are arranged singly or in small clusters within the epidermis and its appendages.