| The dermis or corium underlying the epidermis is 0.3 to 4.0 mm in thickness and may be divided into two layers, papillary and reticular. |
| The reactive epithelium may extend into the superficial reticular dermis, simulating a carcinoma. |
| The skin of D. holocanthus is highly elastic because of microfolds in the epidermis and collagen fibers of the dermis. |
| Occasionally, the upper reticular dermis also may be infiltrated, but by isolated single cells. |
| The dermal-epidermal junction, papillary dermis, and reticular dermis were assessed separately. |
| Mitotic figures are variably present, and tumor aggregates may extend into the reticular dermis or even subcutaneous fat. |
