Dermatological parasitic delusion. A case report.

Authors

  • Julio Torales Cátedra y Servicio de Psiquiatría. Facultad de Ciencias Médicas. Universidad Nacional de Asunción
  • A Arce Cátedra y Servicio de Psiquiatría. Facultad de Ciencias Médicas. Universidad Nacional de Asunción
  • L Bolla Cátedra y Servicio de Dermatología. Facultad de Ciencias Médicas. Universidad Nacional de Asunción
  • L González Cátedra y Servicio de Dermatología. Facultad de Ciencias Médicas. Universidad Nacional de Asunción
  • B Di Martino Cátedra y Servicio de Dermatología. Facultad de Ciencias Médicas. Universidad Nacional de Asunción
  • M Rodríguez Cátedra y Servicio de Dermatología. Facultad de Ciencias Médicas. Universidad Nacional de Asunción
  • O Knopfelmacher Cátedra y Servicio de Dermatología. Facultad de Ciencias Médicas. Universidad Nacional de Asunción

DOI:

https://doi.org/10.18004/

Keywords:

pruritus, erythema, parasitic infestation, delusions, risperidone, Paraguay

Abstract

We report the case of a woman who complained of intense pruritus on the upper and lower lids of both eyes and severe erythema that appeared after scratching. In the interview, the patient reported that these injuries were caused by "bugs and worms that were in her skin and around her eyes. The bugs bit her and forced her to scratch her skin in order to get them out". There was no evidence of parasitic infestation. The psychological examination revealed the presence of delusions of parasite infestation and Delusional Parasitic Infestation was diagnosed. The Delusional Parasitic Infestation, also known as Ekbom syndrome, is classified within the Caroline Koblenzer’s strictly psychiatric skin conditions, in which the patient has a delusion of being infested by insects, worms or lice that inhabit and damage the skin. In most cases, the prognosis is favorable and the disorder has good response to risperidone, as long as the affected patients are adequately treated in a multidisciplinary manner by dermatologists and psychiatrists with expertise in this disease.

References

1. Le L, Gonski PN. Delusional parasitosis mimicking cutaneous infestation in elderly patients.

Med J Aust 2003; 179: 209-214.

2. Trabert W. 100 years of delusional parasitosis: metaánalysis of 1223 case reports.

Psychopathology 1995; 25: 238-246.

3. Lyell A. Delusions of parasitosis. Br J Dermatol 1983; 108: 485-9.

4. Sampaio SA, Rivitti EA. Afecçoes psicogênicas, psicossomáticas e neurogênicas. En:

Sampaio SA, ed. Dermatología. Sao Paulo: Artes Médicas, 2007; 7: 17-24.

5. Musalek M, Bach M, Passweg V, Jaeger S. The position of delusional parasitosis in psychiatric nosology and classification. Psychopathology 1990; 23: 115-124.

6. Wilson WJ: Delusions of parasitosis (Acarophobia). Further observations in clinical practice.

Arch. Dermatol. Syphil 1952; 66:577-585.

7. Wykoff RE. Delusions of parasitosis: a review. Rev Infect Dis 1987; 9: 433-7.

8. American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders. 4ª

ed. Washington: American Psychiatric Association, 1994.

9. Revelli C, Pichon M, Cambazard F, Pellet J, Misery L. Consultation dermato-psychiatrique.

Annales de Dermatologie et de Vénéréologie 2002; 129: 742-5.

10. Musalek M, Kutzer E: The frequency of shared delusions in delusions of infestation. European Arch. Pshychiatr. Neurol. Sciences 1990; 239:263-266.

11. Chuleung K, Jinmi K, Mounghoon L. Delusional parasitosis as “folie a deux”. J Korean Med Sci 2002; 18: 462-5.

12. Daniel E, Srinivasan TN. Folie a Famille: Delusional parasitosis affecting all the members of a family. Indian J Dermatol Venereol Leprol 2004; 70:296-7.

13. Maj K, Maj R. Therapeutic update: use of risperidone for the treatment of monosymptomatic hypochondriacal psychosis. J Am Acad Dermatol 2006;43:683-6.

14. Koo J, Lee CS. Delusions of parasitosis: a dermatologist’s guide to diagnosis and treatment. Am J Clin Dermatol 2006; 2:285-90.

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Published

2026-11-06

How to Cite

Dermatological parasitic delusion. A case report. (2026). Anales of the Faculty of Medical Sciences, 44(2), 81-87. https://doi.org/10.18004/