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Eccrine epithelioma

Last edited: 4/15/2026

Overview

Eccrine epithelioma refers to rare cutaneous adnexal neoplasms originating from sweat glands, with periungual localization being particularly uncommon 1. These tumors encompass benign and malignant subtypes, including eccrine poroma and porocarcinoma, presenting diagnostic and therapeutic challenges due to nonspecific clinical features 1.

Diagnosis

  • Clinical Presentation: Nonspecific growths around nails, often leading to misdiagnosis 1.
  • Demographic Patterns: Males predominantly affected by poroma and porocarcinoma; females affected by all subtypes 1.
  • Location: First toe is most commonly affected in lower extremities 1.
  • Diagnostic Tests: Histopathological examination is essential for definitive diagnosis 1.
  • Misdiagnosis Rate: 25% of cases experienced delayed treatment due to misdiagnosis 1.

    • Management

  • Benign Tumors: Surgical excision is typically recommended 1.
  • Malignant Tumors (Porocarcinoma): Wide local excision with clear margins, possibly combined with lymph node dissection if metastasis is suspected 1.
  • Adjuvant Therapy: Not specifically detailed in the reviewed literature; may include adjuvant radiation or chemotherapy based on staging and risk factors 1.

    • Special Populations

  • Sex Differences: Males more frequently affected by malignant subtypes; specific management considerations may vary 1.
  • Location Specificity: First toe involvement may necessitate specialized surgical approaches to preserve function 1.

    • Key Recommendations

  • Perform histopathological examination for definitive diagnosis of periungual eccrine neoplasms to avoid misdiagnosis and delayed treatment (Evidence: Moderate 1).
  • Consider sex-specific epidemiology in clinical suspicion and management approaches for eccrine epithelioma (Evidence: Moderate 1).
  • Prioritize surgical excision with appropriate margins for both benign and malignant eccrine tumors, tailored to tumor subtype and location (Evidence: Expert opinion 1).

    • References

    1 Rao EM, Knackstedt TJ. A systematic review of periungual eccrine neoplasms. International journal of dermatology 2022. link

    Original source

    1. [1]
      A systematic review of periungual eccrine neoplasms. — Rao EM, Knackstedt TJ International journal of dermatology (2022)
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