What is id reaction (autoeczematization)?

Updated: Oct 16, 2020
  • Author: Matthew P Evans, MD; Chief Editor: Dirk M Elston, MD  more...
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Answer

Id reaction, or autoeczematization, is a generalized acute cutaneous reaction to a variety of stimuli, including infectious and inflammatory skin conditions. The pruritic rash that characterizes the id reaction, which is considered immunologic in origin, has been referred to as dermatophytid, [1] pediculid, [2] bacterid when associated with a corresponding infectious process, and tuberculid when associated with tuberculosis. [3] Clinical and histopathological manifestations are variable and depend on the etiology of the eruption, and systemic manifestations may occur. [4, 5, 6, 7]

See the image below.

Id reaction (autoeczematization). Courtesy of Derm Id reaction (autoeczematization). Courtesy of DermNet New Zealand (http://www.dermnetnz.org/assets/Uploads/dermatitis/a-ecz2.jpg).

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