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MCQs in Tropical Medicine

Rob Skelly DTM+H FRCP

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Answer 34

The following are correctly paired

True a. erythema nodosum: tuberculosis
False b. erythema marginatum: Lyme disease
True c. erythema multiforme: orf
False d. erythema induratum: syphilis
True e. erythema infectiosum: parvovirus B19

Erythema nodosum. This is characterised by tender red swellings usually over the shins. The most common cause is streptococcal infection. Tuberculosis, sarcoidosis, leprosy, sulphonamides and inflammatory bowel disease are other important causes.

Erythema marginatum. This is a non-itchy, pale red, macular eruption. It is a major criterion for the diagnosis of rheumatic fever but is also seen in acute glomerulonephritis and drug reactions.

Erythema multiforme. This is characterised by cutaneous "target" lesions and mucosal involvement. Children and young adults are more commonly affected. Orf, mycoplasma, and herpes simplex are among the known causes.

Erythema induratum. Cutaneous tuberculosis. Otherwise known as Bazin's disease.

Erythema infectiosum. "Slapped cheeks", caused by parvovirus B19.

Erythema chronicum migrans. An expanding annular lesion occurring in Lyme disease.

Erythema gyratum repens. Erythema forming repeated concentric rings. Often there is an underlying malignancy.

Copyright: Rob Skelly 2006