Erythema multiforme

Question 1

Erythema multiforme

Answer 1

• hypersensitivity reaction
• most often triggered by infections
• minor and major forms

Question 2

Features of erythema multiforme

Answer 2

• target lesions
• back of hands/feet, then spreads to torso
• upper limbs more than lower limbs
• occasional itch
• major form -> mucosal involvement

Question 3

Causes of erythema multiforme

Answer 3

1. herpes simplex virus (or other viruses)
2. idiopathic
3. bacteria (mycosplasma, streptococcus)
4. drugs (penicillin, sulphonamides, NSAIDs, allopurinol)
5. connective tissue disease (SLE)
6. sarcoidosis