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Histopathological findings of KA at the early/ proliferative stage. Gross findings of the lesion include crateriform architecture with a central keratinous plug (a). A lip-like structure is observed (b). Pale pink keratinocytes with a glassy appearance are observed. In the deeper areas, pale pink keratinocytes with a glassy appearance are noted (c). The deeper areas of the lesion are poorly demarcated from the surrounding stroma and exhibit slightly invasive growth (d).
