External ear tumors - benign / nonneoplastic

Topic Completed: 1 October 2013

Minor changes: 26 August 2019

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PubMed Search: Keloid [title] ear pathology

Nat Pernick, M.D.
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Cite this page: Pernick N. Keloid. PathologyOutlines.com website. https://www.pathologyoutlines.com/topic/earkeloid.html. Accessed August 8th, 2020.
Definition / general
Case reports
Gross description
  • Polypoid, covered by thin, hairless skin
  • Usually < 2 cm
Microscopic (histologic) description
  • Nonencapsulated
  • Haphazard fascicles of dense, hyalinized collagen that appear edematous due to dermal mucosubstances
  • Scattered fibroblasts and myofibroblasts
  • Blends with adjacent dermal tissue
  • Overlying epithelium is thin and lacks adnexae
  • Widely scattered dilated blood vessels
Differential diagnosis
  • Dermatofibroma: more cellular
  • Dermatofibrosarcoma protuberans: more cellular, usually pseudoepitheliomatous hyperplasia of overlying epidermis
  • Hypertrophic scar: delicate fibrillar collagen in orderly arrangement, usually no abundant mucosubstances; does not recur
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