Different vasculitis

Vasculitis Vessels Lab Findings Key Features Henoch-Schonlein Purpur…

Rashes

Impetigo - classically ruptured honey-coloured vesicles. S aureus or Strep. pyogenes Scarlet fever - flushed face with circumoral pallor, "sa…

Lichen planus

A rash that can affect parts of the body including mouth and hands F >> M skin involvement 10-15% Autoinflammatory disease - T cell i…

Atopic dermatitis (eczema)

A reaction pattern rather than a specific disease Acute - red weeping +/- small vesicles Subacute - red less exudate crusting Chronic - thick leat…

Psoriasis

Well defined red oval plaques on extensor surfaces - fine silvery scale - autoimmune so treat with Anti-TNF & Abatacept Microscopy Regul…

Systemic Lupus Erythematosus

Autoimmune connect tissue disorder Classic 4 symptoms of SLE: Photosensitive malar rash Multiple mouth ulcers Arthralgia Alopecia …

Dermatomyositis

Histologically similar to SLE with photosensitive rash Proximal muscle weakness 25% association with underlying visceral cancer

Bullous diseases

Formation of fluid filled blisters - autoantibodies Pemphigus - intra-epidermal bulla, loss of cohesion so fragile Pemphigoid - sub-epidermal…

Dermatitis Herpetiformis

Small intensely itchy blisters on extensor surfaces Often young pateitns a/w Coeliac disease IgA deposition

Viral exanthema

A wide spread rash that accompanies a viral infection. Quite common. Can appear anywhere but often start on face or trunk and then spread. Vir…

Maculopaplar rash