Lesion of long duration from the buttock of an adult:

Papillomatosis is seen over an area where there are tubular or ductal structures in the right half of the picture. Communication of several tubules or ducts with the epidermis is seen in the left side of the picture. There is a malformed follicle in the left side of the picture that is just to the right of a vertical duct or tubule..

Composite view showing communication of ducts or tubules with the epidermis. Hypergranulosis is noted near the surface. Part of the malformed follicle is in the edge of the right lower part of the picture. This is from the left side of the scanning power view.

This is from the right side of the scanning view. A few tips of epidermal rete ridges are at the top of the picture. Ducts or tubules are in the dermis. Many ducts are lined by a double layer of epithelium Only one of these has fully developed apocrine features. The papillary projections in the lumen of the duct that connects with the epidermis do not contain connective tissue cores.

The inner layer is composed of low columnar epithelium. There is a peripheral rim of round or cuboidal cells. This combination can be seen in primitive apocrine epithelium.

Three tubular lumina are in this malformed follicle. The epithelium lining the tubules is cuboidal but nondescript. I do not know what the red blobs represent.

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