Erythema Multiforme
Erythema Multiforme Minor
Target lesions
No mucosal involvement
least severe
Erythema Multiforme Major/SJS
Nikolsky sign
mucosal involvement
< 10% BSA
Toxic Epidermal Necrolysis
Nikolsky sign
mucosal involvement
most severe
How to differentiate between SJS and TEN?
amount of BSA
> 30% BSA is TEN
< 10% is SJS/erythema multiforme
between 10-30% is grey area