Pathogenesis:

Histology:

Clinical:

Immune complexes:

Neutrophils:

LCV

Pustules

Urticarial

Purpura/

Ulcers

arthritis

IgA

Dapsone

Sweet’s sx

yes

+/-

used

PG

yes

+

used

E. nodosum

(yes?)

LCV:

yes

(yes)

yes

+/-

+

used

HSP

yes

(yes)

yes

+

+

DIF

EED

yes

(yes)

yes

IgA paraproteinemia ?

invariably effective

Mixed cryos

yes

(yes)

yes

+

Urticarial vasculitis

yes?

yes

+

SLE

yes

+

+

serum sickness

yes

+

+

Still’s disease

yes?

+

+

E. marginatum

yes?

+

+

Behcets

yes

+

Bowel associated dermatosis arthritis sx:

yes

+

+

SCPD

yes

+

DIF in subset

used

DH

yes

DIF

invariably effective

linear IgA

DIF