A multi-system vasculitis where a pathergy test (sterile needle prick) induces a characteristic pustule due to a neutrophilic response.
An autoimmune disease where neutrophils characteristically accumulate at the tips of the dermal papillae, leading to subepidermal blisters.
A rare vasculitis presenting as persistent, firm, red-to-purple plaques and nodules over extensor surfaces and joints.
The hallmark is palpable purpura, caused by a neutrophilic infiltrate around small blood vessels leading to their destruction.
An autoimmune disease where a band-like infiltrate of neutrophils along the basement membrane causes vesicles and bullae.
A localized variant of Sweet's syndrome presenting as tender, erythematous plaques with a pseudovesicular or bullous appearance on the back of the hands.
Presents as tender, erythematous plaques and papules, often in patients on chemotherapy, caused by a neutrophilic infiltrate specifically around eccrine sweat glands.
Characterized by an inflammatory papule or pustule that rapidly expands into a painful ulcer with a distinctive violaceous, undermined, and irregular border.
Presents with the abrupt onset of fever and tender, erythematous, edematous "juicy" plaques and nodules, often with a pseudovesicular appearance.
