Histology revealed a dermis with numerous glandular structures surrounded by sclerotic and homogeneous collagen (Figure 3). At higher magnification, the glandular structures were seen to be formed of cells with a pale or pink cytoplasm, arranged in nests and tubules. The tubular areas were formed by a double layer of cuboidal cells around a central lumen lined by a dense eosinophilic cuticle. Some of these ducts had a tadpole tail-like epithelial prolongation.