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  5. Scab
  • Scabies is a highly scratchy infectious disease.
  • It is caused by the Scabie variety hominis.
  • The itching worsens during the night.
  • Without treatment, the itching does not subside.
  • Eventually the person infects other family members
  • With treatment the itching subsides after one or more months
  • Nodules subside later.
  • The Norwegian scabies (thousands to millions of mites are found in the lesions) may occur in an epidemic form.
  • The non-remission of the itching after the end of the treatment may be due to reinfection or inadequate treatment.
  • The main finding is the spore tunnel. Its shape is straight, curved or shaped S. The range is 1-2 mm. Length up to 15 mm. It is white in color while the supernatant skin is slightly elevated.
  • It is usually found in the wrists, the mesoacral folds of the hands, the lateral surfaces of the hand and foot limbs, the genitals, the warm areas and the abdomen.
  • In infants scab is located on the scalp, palms and soles. There could be pustules.
  • Secondary lesions (which are very common) are due to eczema skin reaction. At the same time numerous abrasions are observed.
  • On contamination, the melitochroes scabs of the molluskium are observed.
  • Nodules may appear on the buttocks, genitals or armpits.
  • They may persist for several weeks despite the granting of appropriate treatment.
  • Norwegian scabies is a specific form of scabies. Patients, who usually suffer from senile dementia, Down syndrome or are immunoinfected, exhibit asymptomatic etracidal and dermatitis that is mainly found in the limbs.
  • There are numerous mites.
Differential diagnosis
  • Insect-biting
  • Eczema
  • Infective
  • Scabies should be included in the differential diagnosis of any pruritic rash that does not subside with the administration of prednisone.