“…The histopathologic differential diagnosis also includes BCC, SCC, and microcystic adnexal carcinoma. Shave biopsies can make it difficult to distinguish DTs from malignant tumors such as well‐differentiated SCCs because desmoplastic trichoepithelomas can produce a reactive pseudoepitheliomatous (pseudocarcinomatous) process. In difficult cases, immunohistochemistry markers such as cytokeratins 20, 10, 15, and d2‐40, usually positive in DT, may confirm the diagnosis .…”