An arterial ulcer is caused by ischemia, often found on the toes or pressure points, and is associated with signs of poor circulation like absent pulses, unlike the infectious nature of ecthyma.
This is a specific necrotic ulcer seen in immunocompromised patients with Pseudomonas aeruginosa bacteremia, characterized by a central black eschar, a more severe presentation than typical ecthyma.
This is a misspelling/variant of Ecthyma gangrenosum and is distinguished by its association with Pseudomonas sepsis and a central necrotic eschar.
A furuncle (boil) is a deep, tender abscess of a hair follicle, which is a nodular lesion, whereas ecthyma is a "punched-out" ulcerative lesion.
This is a ruptured, inflamed subcutaneous cyst, which presents as a tender nodule, not a primary ulcer like ecthyma.
Cystic acne consists of inflammatory nodules and cysts on the face and trunk, a different morphology and location than the crusted ulcers of ecthyma on the lower legs.
A vasculitic ulcer often arises from palpable purpura and may have an irregular, stellate shape, reflecting vessel inflammation, unlike the round, "punched-out" appearance of ecthyma.
