Erythema Nodosum Flashcards

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1
Q

Definition of erythema nodosum?

A

Inflammation of subcutaneous fat (panniculitis) - type IV hypersensitivity

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2
Q

Causes of erythema nodosum?

A

Infections
Systemic diseases
Drugs
Pregnancy

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3
Q

Which infections can cause erythema nodosum?

A

Strep pyogenes
TB
HIV

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4
Q

Which systemic diseases can cause erythema nodosum?

A

IBD
Sarcoidosis
Behcet’s disease

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5
Q

Which drugs (and their class) can cause erythema nodosum?

A

Sulphonamides - antibiotics

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6
Q

Clinical features of erythema nodosum?

A
Bilateral nodules
Tender
Red/purple
Distribution (anterior shins, knees)
- does not ulcerate or scar
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7
Q

Demographic for erythema nodosum?

A

Young adults

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8
Q

What type of hypersensitivity are both erythema nodosum and erythema multiforme?

A

Hypersensitivity type 4 (both)

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9
Q

Lesion distribution characteristic of erythema nodosum?

A

Anterior shins

Knees

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