case_images: PMC11063467_01
case_images: Four red nodules of different sizes, from 4 mmx3 mm to 10 mmx6 mm, were seen on the right chest, with a crater-like horn plug in the center. Lesions were clustered together and looked like a "lucky four-leaf clover".
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case_images: PMC11063467_01_CCID-17-921-g0001.jpg
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case_images: Four nodules were clustered together and looked like a "lucky four-leaf clover" (Figure 1).
case_images: Histopathological Findings. (A) The epidermal depression expanded like a volcanic crater filled with keratinocytes and keratin (HEx40). (B) Squamous epithelial nests infiltrated into the deep irregularly with smooth contours. The top of the deep epithelial nests had increased keratinized beads. The keratinocytes had rich cytoplasm and were eosinophilic (HEx100). (C) A large number of inflammatory cells infiltrated the superficial dermis. Some epithelial cells were atypical. The adjacent epidermis formed an exogenic protrusion, creating a lip-like contour (HEx200).
case_images: CCID-17-921-g0002.jpg
case_images: PMC11063467_01_CCID-17-921-g0002.jpg
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case_images: The adjacent epidermis formed an exogenic protrusion, creating a lip-like contour (Figure 2).