| • | AKA erythema induratum (sometimes used to describe the subset of patients where lesion is associated with tuberculosis) |
| • | pathogenesis: primary insult appears to be a vasculitis of subcutaneous blood vessels with subsequent ischemic changes producing lipocytic injury and inflammation |
clinical:
| • | chronic, recurrent, often bilateral |
| • | tender, subcutaneous nodules or plaques (like all panniculitis) |
| • | predilection for calf area |
| • | often ulcerate before healing with an atrophic scar |
ddx:
| • | erythema nodosum (but e. nodosum has short duration, rapid development, does not ulcerate, and affects chiefly the anterior rather than the posterior calves) |
treatment:
| • | if PPD (-), bed rest and systemic steroids |
see also Tuberculosis/ tuberculids
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