Ecthyma gangrenosum

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Ecthyma gangrenosum is an infection of the skin typically caused by Pseudomonas aeruginosa that is a round or oval 1- to 15-cm lesion with a halo of erythema and usually with a necrotic center representing where the organism has invaded blood vessels and produced hemorrhagic infarctions. These ulceritic lesions are single or multiple and heal with scar formation. It is a possible complication of sepsis from pseudamonal organisms or other gram negative bacteria.