Toxic epidermal necrolysis {TEN} involves body surface area
Based on body surface area ( BSA) of skin involved, epidermal necrolysis is classified into SJS: less than 10% BSASJS_TEN overlap: 10-30% BSA TEN : more than 30% BSA. From illustrated synopsis of dermatology and sexually transmitted diseases neena khanna 5th edition page no 92
<10%
10-20%
20-30%
>30
Vestibulobullous disorders