Erythema Nodosum Flashcards
1
Q
Definition of erythema nodosum?
A
Inflammation of subcutaneous fat (panniculitis) - type IV hypersensitivity
2
Q
Causes of erythema nodosum?
A
Infections
Systemic diseases
Drugs
Pregnancy
3
Q
Which infections can cause erythema nodosum?
A
Strep pyogenes
TB
HIV
4
Q
Which systemic diseases can cause erythema nodosum?
A
IBD
Sarcoidosis
Behcet’s disease
5
Q
Which drugs (and their class) can cause erythema nodosum?
A
Sulphonamides - antibiotics
6
Q
Clinical features of erythema nodosum?
A
Bilateral nodules Tender Red/purple Distribution (anterior shins, knees) - does not ulcerate or scar
7
Q
Demographic for erythema nodosum?
A
Young adults
8
Q
What type of hypersensitivity are both erythema nodosum and erythema multiforme?
A
Hypersensitivity type 4 (both)
9
Q
Lesion distribution characteristic of erythema nodosum?
A
Anterior shins
Knees