Authors: Raphaela Martina C. Pineda, MD, Maria Jasmin J. Jamora, MD, FPDS


Introduction: Keratoacanthoma is a rapidly growing hyperkeratotic tumor usually associated with sun exposure. The most common of which is the solitary keratoacanthoma. We present a case of a solitary Keratoacanthoma on the dorsal aspect of the right foot.

Case summary: A 73-year-old Filipino male presented with 4-month history of swiftly growing dome shaped, hyperkeratotic nodule on the dorsal aspect of the right foot. A sample lesion was biopsied. Histopathology was done which yielded results  consistent with Keratoacanthoma.

Conclusion: Histopathology confirmed the diagnosis of Keratoacanthoma. Histopathological examination may be a challenge when it comes to differentiating Squamous Cell Carcinoma In Situ and Keratoacanthoma. However, proper evaluation and clinical correlation should be done to prevent missing the diagnosis and ensure proper management.





Keratoacanthoma, Nodule

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