Id reactions

Last Updated: 2023-07-07

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

ICD11: EA88.2

Secondary reactions to fungi (trichophytes, epidermophytid, microsporid) in hyperergic immune state.

In the case of dermatophyte infection, an antigen resorption and finally an antigen-antibody reaction occur in a hyperergic immune situation. From an immunological point of view, this is a type IV reaction. The Id reaction usually occurs far from the focus.

Dyshidrosiform, nodular or multiforme erythema, usually on the extremities.

Lichen trichophyticus is a special form: This is a symmetric, disseminated seeding of follicular papules localised to the trunk.

Anamnesis

Clinical

Mycological diagnosis

Immune testing is not recommended

.

Very good if the causative mycosis is treated effectively.

  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.