Palpable purpura

Not to be confused with Erythema annulare centrifugum.

Palpable purpura is a condition where purpura, which constitutes visible non-blanching hemorrhages, are raised and able to be touched or felt upon palpation.

Causes

References

Bagai, A; Albert, S; Shenoi, SD (Nov–Dec 2001). "Evaluation and therapeutic outcome of palpable purpura.". Indian journal of dermatology, venereology and leprology 67 (6): 320–3. PMID 17664788.
ARIAS-SANTIAGO, S.; ANEIROS-FERNANDEZ, J.; GIRON-PRIETO, M. S.; FERNANDEZ-PUGNAIRE, M. A.; NARANJO-SINTES, R. (3 March 2010). "Palpable purpura". Cleveland Clinic Journal of Medicine 77 (3): 205–206. doi:10.3949/ccjm.77a.09065.

Hypersensitivity and autoimmune diseases (279.5–6)

Type I/allergy/atopy
(IgE)

Foreign	Atopic eczema Allergic urticaria Allergic rhinitis (Hay fever) Allergic asthma Anaphylaxis Food allergy common allergies include: Milk Egg Peanut Tree nut Seafood Soy Wheat Penicillin allergy

Autoimmune	Eosinophilic esophagitis

Type II/ADCC

- IgM
- IgG

Foreign

Hemolytic disease of the newborn

Autoimmune

Cytotoxic	Autoimmune hemolytic anemia Immune thrombocytopenic purpura Bullous pemphigoid Pemphigus vulgaris Rheumatic fever Goodpasture's syndrome Guillain–Barré syndrome

"Type V"/receptor	Graves' disease Myasthenia gravis Pernicious anemia

Type III
(Immune complex)

Foreign	Henoch–Schönlein purpura Hypersensitivity vasculitis Reactive arthritis Farmer's lung Post-streptococcal glomerulonephritis Serum sickness Arthus reaction

Autoimmune	Systemic lupus erythematosus Subacute bacterial endocarditis Rheumatoid arthritis

Type IV/cell-mediated
(T cells)

Foreign	Allergic contact dermatitis Mantoux test

Autoimmune	Diabetes mellitus type 1 Hashimoto's thyroiditis Multiple sclerosis Coeliac disease Giant-cell arteritis Postorgasmic illness syndrome Reactive arthritis

GVHD	Transfusion-associated graft versus host disease

Unknown/
multiple

Foreign	Hypersensitivity pneumonitis Allergic bronchopulmonary aspergillosis Transplant rejection Latex allergy (I+IV)

Autoimmune	Sjögren's syndrome Autoimmune hepatitis Autoimmune polyendocrine syndrome APS1 APS2 Autoimmune adrenalitis Systemic autoimmune disease

Systemic vasculitis (M30–M31, 446)

Large vessel

Medium vessel

Small vessel

Pauci-immune	c-ANCA Granulomatosis with polyangiitis p-ANCA Churg-Strauss syndrome Microscopic polyangiitis

Type III hypersensitivity	Hypersensitivity vasculitis/Henoch–Schönlein purpura

Ungrouped	Acute hemorrhagic edema of infancy Cryoglobulinemic vasculitis Bullous small vessel vasculitis Cutaneous small-vessel vasculitis

Other

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Palpable purpura

Causes

References

Further reading