Id reactions

Last Updated: 2019-08-26

Author(s): Anzengruber F., Navarini A.

ICD11: -

Secondary reactions to fungi (trichophytes, epidermophytide, microsporide) or other infectious agents in hyperergic immune states.

Dermatophyte infection is a hyperergic immune condition that leads to antigen resorption and finally to an antigen-antibody reaction. From an immunological point of view, this is a type IV reaction. The Id reaction usually occurs far away from the focus.

Dyshidrosiform, nodular or multiform erythema, mostly on the extremities.

A special form is the Lichen trichophyticus: It is a symmetrical, disseminated sowing of follicular papules located on the stem.



Infectiological Diagnostics 

Testing of the immune status is not recommended.

With effective treatment of causative mycosis or other infectious disease very good.

  1. Atzori L, Pau M, Aste M. Erythema multiforme ID reaction in atypical dermatophytosis: a case report. J Eur Acad Dermatol Venereol. 2003 Nov;17(6):699-701. 
  2. Sorey W. Diagnosis: Dermatophytid reaction (Id reaction). Commentary. Clin Pediatr (Phila). 2009 Apr;48(3):335. 
  3. Iglesias ME, España A, Idoate MA, Quintanilla E. Generalized skin reaction following tinea pedis (dermatophytids). J Dermatol. 1994 Jan;21(1):31-4. 
  4. Mayser P. Dermatophyte : Current situation. Hautarzt. 2017 Apr;68(4):316-323.