Skin-nontumor / Clinical Dermatology

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Skin-nontumor / Clinical Dermatology

Infestations

Scabies (mite)

Reviewer: Mowafak Hamodat, MB.CH.B, MSc., FRCPC, Eastern Health, St. Johns, Canada (see Reviewers page)
Revised: 23 April 2014, last major update July 2011
Copyright: (c) 2002-2011, PathologyOutlines.com, Inc.

Definition
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● Mite that produces burrows and extremely pruritic erythematous papules on interdigital skin, palms, wrists

Treatment
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● Topical permethrin (Can Fam Physician 2010;56:1005)

Diagrams
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Life cycle

Micro description
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● Burrow appears as cleft in upper epidermis containing mite body parts
● Epidermis exhibitis acanthosis, parakeratosis, spongiosis, with dense eosinophilic dermal infiltrate
● In the dermis, there is superficial perivascular and sometimes diffuse infiltrate of lymphocytes and histiocytes, sometimes accompaned by neutrophils and less often eosinophils
● In nodular skin lesions, the dermal infiltrate may be very dense and in addition to histiocytes, plasma cells, eosinophils, and lymphocytes, atypical and hyperchromatic cells may be evident

Micro images
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Mite

Contributed by: Dr. Daniel Ostler, Baylor College of Medicine, Texas (USA)

End of Skin-nontumor / Clinical Dermatology > Infestations > Scabies (mite)

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