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February 10, 2012

Scabies (cont.)

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Are cases of scabies often misdiagnosed?

Scabies is very easy to misdiagnose because early subtle infestation may look like small pimples or mosquito bites. Those affected may believe they have another condition, such as bedbug bites or other kinds of rashes. Over a few weeks, however, mistakes like this become evident as patients feel worse and worse with symptoms they can't ignore.

What are possible complications of scabies?

The intense itching of scabies leads to prolonged and often intense scratching of the skin. When the skin is broken or injured due to scratching, secondary bacterial infections of the skin can develop from bacteria normally present on the skin, such as Staphylococcus aureus or beta-hemolytic streptococci.

In what special situations can scabies be more easily spread?

Elderly and weakened people in nursing homes and similar institutional settings may harbor scabies without showing significant itching or visible signs. In such cases, there can be widespread epidemics among patients and health-care workers. Such cases are dramatic but, fortunately, uncommon.

What is Norwegian or crusted scabies?

Norwegian scabies, or crusted scabies, is a severe form of scabies first described in Norway. Crusted scabies almost always affects people with a compromised immune system and is observed most frequently in the elderly, those who are mentally or physically disabled, and in patients with AIDS, lymphoma, or other conditions that decrease the effectiveness of the immune response. Due to the poor function of the immune system, an individual may become infested with hundreds of thousands of the mites. The lesions of this distinctive form of scabies are extensive and may spread all over the body. The elbows, knees, palms, scalp, and soles of the feet are most commonly the original sites of involvement, and the scaly areas eventually take on a wart-like appearance. The fingernails can be thickened and discolored. Interestingly, itching may be minimal or absent in this form of scabies.

A particular danger of crusted scabies is that these lesions often predispose to the development of secondary infections, as with staphylococcus bacteria.

Medically reviewed by Norman Levine, MD, Board Certified - American Board of Dermatology

REFERENCES:

Chosidow, O. "Clinical Practices. Scabies." N Engl J Med 354.16 Apr. 2006: 1718-1727.

Cordoro, Kelly M. "Dermatologic Manifestations of Scabies." Medscape. Dec. 9, 2009. <http://emedicine.medscape.com/article/1109204-overview>.

Dourmishev, A.L., L.A. Dourmishev, and R.A. Schwartz. "Ivermectin: Pharmacology and Application in Dermatology." Int J Dermatol 44.12 Dec. 2005: 981-988.

McCroskey, Amy L., and Adam J. Rosh. "Scabies." eMedicine.com. Apr. 5, 2010. <http://emedicine.medscape.com/article/785873-overview>.

United States. Centers for Disease Control and Prevention. "Scabies." Nov. 10, 2008. <http://www.cdc.gov/scabies/index.html>.


Last Editorial Review: 5/25/2011


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