Scab

Description

History

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.

Findings

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

Caution

Scabies should be included in the differential diagnosis of any pruritic rash that does not subside with the administration of prednisone.