Chapter: Medicine and surgery: Dermatology and soft tissues

Scabies - Parasitic skin infections

Skin infestation by the mite Sarcoptes scabiei, causing itching. - Definition, Incidence, Aetiology, Pathophysiology, Clinical features, Complications, Investigations, Management, Prognosis.

Scabies

 

Definition

 

Skin infestation by the mite Sarcoptes scabiei, causing itching.

 

Aetiology/pathophysiology

 

Transmission of the mite occurs by skin–skin contact with an infested individual or contaminated clothing or bedding. The mite burrows down into the stratum corneum of the skin and then the female lays eggs.

 

Clinical features

 

There is often a widespread, erythematous urticating rash all over the body as a result of a hypersensitivity reaction to the mite. Patients present with severe itching usually worse at night.

 

On examination small papules and linear tracks, caused by burrowing mites, are seen around the wrists, finger webs and ankles (and scrotum in the male).

 

In immunosuppressed patients, Norwegian/crusted scabies may occur with diffuse scaly erythematous patches especially on the scalp, hands and feet.

 

Investigations

 

The burrows and distribution pattern is very suggestive of the diagnosis. The mite can be visualised using a dermatoscope.

 

Management

 

Patients are extremely infectious and require barrier nursing. The entire skin except the face should be treated with malathion or permethrin. All close contacts require treatment, and clothing and bed linen should be thoroughly machinewashed. Norwegian/crusted scabies may require repeated treatments.

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Medicine and surgery: Dermatology and soft tissues : Scabies - Parasitic skin infections |


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