Erythema induratum

Erythema induratum
Erythema induratum
Classification and external resources
Specialty	infectious disease
ICD-10	A18.4 (ILDS A18.482)
ICD-9-CM	017.1
DiseasesDB	1272
eMedicine	derm/135
MeSH	D004891
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Bazin disease (or "Erythema induratum") is a panniculitis on the back of the calves.

It was formerly thought to be a reaction to the tuberculum bacillus. It is now considered a panniculitis that is not associated with a single defined pathogen.

It occurs mainly in women, but is very rare now.

Predisposing factors include abnormal amount of subcutaneous fat, thick ankles and abnormally poor arterial supply. Abnormal arterial supply causes low-grade ischemia of ankle region. The ankle skin becomes sensitive to temperature changes. When weather is cold, ankle is cold, blue and often tender. In hot weather, ankle becomes hot, edematous, swollen and painful. Chilblains may be present. On palpation, small superficial and painful nodules are felt. They break down to form small and multiple ulcers. Fresh crops of nodules appear in periphery of ulcer and ultimately break down. In nodular stage, pain is present; while it subsides in ulcerative stage.

It is named for Pierre-Antoine-Ernest Bazin.

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