<unk>  is a type of skin lesion characterized by vesicles or blisters which rapidly evolve into pustules and necrotic ulcers with undermined tender erythematous border.<unk> " means a pus forming infection of the skin with an ulcer, "gangrenosum" refers to the accompanying gangrene or necrosis. It is classically associated with Pseudomonas aeruginosa bacteremia, but it is not pathognomonic. Pseudomonas aeruginosa is a gram negative, aerobic bacillus. This type of skin lesion was first described in association with Pseudomonas aeruginosa by L. Barker in 1897. It was given the name<unk> " by Hitschmann and Kreibich. It mostly occurs in patients with underlying immunocompromise (e.g. malignancy or HIV). Although most cases are due to Pseudomonas aeruginosa infection, there are recent reports of this skin lesion in association with other microorganisms, such as Escherichia coli, Citrobacter freundii, Klebsiella pneumoniae, various other Pseudomonas species, and Morganella morganii.
Ecthyma gangrenosum
Pyoderma gangrenosum
Lichen myxedematosus
Tuberculosis verrucosa cutis
Granuloma faciale
Epidermolysis bullosa
Streptococcal intertrigo
Pseudomonal pyoderma