Process stops at pustular stage (ie, does not coalesce and ulcerate)

Pustule might last up to several months; seems to be limited to patients with IBD; and tends to occur on trunk and extensor limb surfaces⁷

Bullous areas spread rapidly in a concentric pattern⁵

Areas break down to form superficial ulcers; are often associated with hematologic malignancies; and affect upper limbs and face most commonly⁸

Typically presents as a solitary furunculoid purple abscess, nodule, or plaque most commonly located on the trunk

Lesions are often not painful and tend to enlarge slowly

Lesions respond well to topical therapy and are usually not associated with systemic disease⁹

Ulcers occur close to abdominal stomas; have a similar morphology to classic PG; and often interfere with adherence of stoma bag to abdominal wall¹⁰