Aggressive digital papillary adenocarcinoma is a rare neoplasm of eccrine sweat gland origin. An acral location and a high recurrence rate are characteristic features. Its histopathologic features are distinctive, and the tumor expresses carcinoembryonic and S-100 protein antigens. We demonstrated immunoreactivity of the tumor to ferritin antibody, a new immunohistologic marker for sweat gland malignancies.