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To the Editor.—
A recent issue of the Archives (109:251, 1974) contains the description of an epidermoid cyst. The article begins with the statement that epidermal inclusion cysts are the commonest type of epithelial cysts of the skin, and later calls the cyst an implantation cyst, although there was no history of penetrating or even blunt trauma. Without considering other possibilities, the author subscribes to the hypothesis that all cutaneous cysts lined with epidermoid epithelium are "inclusion" or "implantation" cysts, even including multiple lesions and the familial, ie, genetically determined, cysts of Gardner syndrome.The one modern paper he quotes for experimental proof of implantation origin (Arch Dermatol 76:437, 1957) actually deals with a different situation; in a series of 28 cases, large pieces of hairy skin were buried subcutaneously and produced hair-bearing skin cysts. In that report, Epstein and Kligman gave, in fact, a balanced discussion of various possibilities
Pinkus H. Epidermoid Cysts or Epidermal Inclusion Cysts? Arch Dermatol. 1975;111(1):130. doi:10.1001/archderm.1975.01630130132024
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