II. Epidemiology

  1. More often seen in women over age 50 years

III. Classification

  1. Monosymptomatic Hypochondriacal Psychosis

IV. Symptoms

  1. Patient convinced of Parasite infestation

V. Signs

  1. Matchbox Sign
    1. Patient presents container with purported parasite
  2. Focal erosions on exposed areas of arms and legs
    1. Results from attempts to pick bugs from skin

VII. Labs (consider for differential diagnosis evaluation)

VIII. Management

  1. Confirm diagnosis
    1. Rule-out true parasitic cause of symptoms
    2. Evaluate for differential diagnosis as above
  2. General measures
    1. Establish patient's trust
      1. Listen
      2. Communicate empathy and sensitivity
      3. Avoid offending or further isolating patient
    2. Consider psychotherapy
  3. Pimozide (Orap)
    1. Initial dose: One-half of a 2 mg tablet qd
    2. Titrate dose: Increase dose by 1 mg/week to 4-6 mg qd

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Ontology: Entomophobia (C1068608)

Concepts Plant (T002)
English Entomophobia

Ontology: Parasitophobia (C1279419)

Concepts Mental or Behavioral Dysfunction (T048)
SnomedCT 238962005, 238963000, 198280005
English Parasitophobia (disorder), Parasitophobia, Parasitophobia (finding), parasitophobia, Parasitophobia [Ambiguous]
Spanish fobia a los parĂ¡sitos, parasitofobia (hallazgo), parasitofobia