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Both biopsy specimens showed similar findings. Intradermal cystic structures were lined by squamous epithelium and were filled with laminated orthokeratotic keratin fragments. Numerous sebaceous lobules were observed radiating from the cystic structures. Surrounding stroma showed mesenchymal changes, including proliferation of fibrous, adipose, and vascular tissues. The follicular opening is evident in Figure 2.
Multiple Papules and Nodules on the Forearm—Diagnosis. Arch Dermatol. 2003;139(6):803-808. doi:10.1001/archderm.139.6.803-a