Infestations and Bites. Medical Student Core Curriculum in Dermatology. Last updated August, 2011. Goals and Objectives.
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Medical Student Core Curriculum
Last updated August, 2011
Exam of occipital scalp: Structures on the hair are not freely movable
Exam of occipital scalp: numerous nits
This image shows a nit without an intact cap (operculum) and is not viable (no larva inside).
Continued presence of nits does not always represent treatment failure.
Refer to the HIV Dermatology module for more information on crusted scabies
For difficult to treat or severe scabies, refer to a dermatologist
Edematous papules scattered over the body. Some with signs of excoriation.
This case shows the characteristic
“Red (peripheral erythema),
White (blanching), and
Blue (central violaceous area)”
sign of the brown recluse bite.
MRSA infections may frequently be mistaken for spider bites. Pyoderma gangrenosum and erythema migrans (Lyme disease) may be considered also.
Bronstein AC, Spyker DA, Cantilena LR, et al. 2008 Annual Report of the American Association of Poison Control Centers’ National Poison Data System (NPDS): 26th Annual Report. Clinical Toxicology. 2009; 47: 1027.
Chosidow O. Scabies and pediculosis. Lancet. 2000; 355(9206): 819-26.
Epocrates Rx [database for PDA]. Version 9.0. San Mateo (CA): Epocrates, Inc. c2009 [updated 2010 Sept; cited 2010 Sept]. Available from: http://www.epocrates.com.
Goldstein BG, Goldstein AO. Scabies. In: UpToDate, Basow, DS (Ed), UpToDate, Waltham, MA, 2011.
James WD, Berger TG, Elston DM, “Chapter 20. Parasitic Infestations, Stings, and Bites” (chapter). Andrews’ Diseases of the Skin Clinical Dermatology. 10th ed. Philadelphia, Pa: Saunders Elsevier; 2006: 446-448.
Kolb A, Needham GR, Neyman KM, High WA. Bedbugs. Dermatol Ther. 2009; 22 (4):347-52.
Meinking TL, Burkhart CN, Burkhart CG, Elgart G. Infestations. In: Bolognia JL, Jorizzo, JL, Rapini RP, eds. Dermatology. 2nd ed. Spain: Elsevier; 2008. MD Consult Web site. Available at http://www.mdconsult.com/books/page.do?eid=4-u1.0-B978-1-4160-2999-1..50088-6&isbn=978-1-4160-2999-1&sid=1055850616&type=bookPage§ionEid=4-u1.0-B978-1-4160-2999-1..50088-6--cesec2&uniqId=219284186-4#4-u1.0-B978-1-4160-2999-1..50088-6--cesec2 Accessed September 20, 2010.
Steen Christopher J, Schwartz Robert A, "Chapter 210. Arthropod Bites and Stings" (Chapter). Wolff K, Goldsmith LA, Katz SI, Gilchrest B, Paller AS, Leffell DJ: Fitzpatrick's Dermatology in General Medicine, 7e: http://www.accessmedicine.com/content.aspx?aID=3000969.
Stone Stephen P, Goldfarb Jonathan N, Bacelieri Rocky E, "Chapter 208. Scabies, Other Mites, and Pediculosis" (Chapter). Wolff K, Goldsmith LA, Katz SI, Gilchrest B, Paller AS, Leffell DJ: Fitzpatrick's Dermatology in General Medicine, 7e: http://www.accessmedicine.com/content.aspx?aID=2971870.
Wolf R, Davidovici B. Treatment of scabies and pediculosis: facts and controversies. Clin Dermatol. 2010; 28(5): 511-8.